220920

# print('Hello')

#print('Hello World')

# print('Hello')
# print('World')

# print("'Hello'")

# print('"Hello World"')

# print('"!@#$%^&*()\'')

# print('"C:\\Download\\\'hello\'.py"')

# x = input()
# print(x)
# print(type(x))
#
# x = int(x)
# print(type(x))

# x = x + 50 (o)
# x + 50 = x (x)

# str: 문자열
# chr: 문자
# int: 정수(숫자)
# float: double: 실수

# x, y = map(int, input().split())
# x, y = input().split()
# x = int(x)
# y = int(y)
#
# print(x, y)

# x = input().split()
#
# print(x)

# x = input()
# print(x)

# x = input()
# x = float(x)
# print(x)

# a = input()
# b = input()
# a = int(a)
# b = int(b)
# print(a)
# print(b)

# a = input ()
# b = input ()
# print(b)
# print(a)

# x = input()
# x = float(x)
# print(x)
# print(x)
# print(x)

# x, y = input().split()
# print(x)
# print(y)

# x,y = input().split()
# print(y,x)

# x = input()
# print(x,x,x)

# x = input()
# x = int(x)
# print(-x)

# x = input()
# x = chr(ord(x) + 1)
# print(x)
#ord 문자를 숫자로 바꿔줌

# a, b = input().split()
# a = int(a)
# b = int(b)
# print(a-b)

# a, b = input().split()
# a = float(a)
# b = float(b)
# print(a*b)

# a, b= input().split()
# print(a*int(b))

# a = input()
# b = input()
# print(int(a)*b)

# a, b = input().split()
# a = int(a)
# b = int(b)
# print(a**b)

# a, b = input().split()
# a = float(a)
# b = float(b)
# print(a**b)

# a, b = input().split()
# a = int(a)
# b = int(b)
# print(a//b)

# a, b = input().split()
# a = int(a)
# b = int(b)
# print(a%b)

# a = input()
# print(a[0])
# print(a[1])
# print(a[2])
# print(a[3])
# print(a[4])
# print(a[5])

# a, b, c = input().split()
# a=int(a)
# b=int(b)
# c=int(c)
# print(a+b+c, end=' ')
# print('%.2f' %((a+b+c)/3))

# a, b = input().split()
# a=int(a)
# b=int(b)
# print(a<b)

# a, b = input().split()
# a = int(a)
# b = int(b)
# print(a==b)

# a, b = input().split()
# a = int(a)
# b = int(b)
# print(a<=b)

# a, b = input().split()
# a = int(a)
# b = int(b)
# print(a!=b)

# a = input()
# a = bool(int(a))
# print(a)

# a = input()
# a = bool(int(a))
# print(not a)

# a, b = input().split()
# a = bool(int(a))
# b = bool(int(b))
# print(a and b)

# a, b = input().split()
# a = bool(int(a))
# b = bool(int(b))
# print(a or b)

# a, b = input().split()
# a = bool(int(a))
# b = bool(int(b))
# print((not a and b) or (a and not b))

# a, b = input().split()
# a = bool(int(a))
# b = bool(int(b))
# print((a and b) or (not a and not b))

# a, b = input().split()
# a = bool(int(a))
# b = bool(int(b))
# print((not a and not b))

# a, b = input().split()
# a = int(a)
# b = int(b)
# x = a-b if a>b else b-a
# print(x)

# a, b = input().split()
# a = int(a)
# b = int(b)
# x = a if a>b else b
# print(x)


# a, b, c = input().split()
# a = int(a)
# b = int(b)
# c = int(c)
# x = a if a<b else b
# x = x if x<c else c
# print(x)

# x = int(input())
#
# if x > 100:
#     print('^^^^^')
# elif x > 50:
#     print('@@@@@')
# elif x > 25:
#     print('#$%#$%')
#     if x%2==0:
#         print('ASSDEWR')
# else:
#     print('FSDAFSDFSD')

# a, b, c = input().split()
# a=int(a)
# b=int(b)
# c=int(c)
# if a+b<=c:
#     print('삼각형아님')
# elif a == b and b == c:
#     print('정삼각형')
# elif a == b  or b == c or a == c:
#     print('이등변삼각형')
# elif a**2 + b**2 == c**2:
#     print('직각삼각형')
# else:
#     print('삼각형')

# a = int(input())
# x = a//10
# y = a%10
# z = (y*10+x)*2 % 100
# if z<=50:
#     print(z)
#     print('GOOD')
# else:
#     print(z)
#     print('OH MY GOD')

# a, b = input().split()
# a = int(a)
# b = int(b)
#
# if b >= 30:
#     print(a, b-30)
# else:
#     if a == 0:
#         print(23, b+30)
#     else:
#         print(a-1, b+30)

# a, b, c = input().split()
# a = int(a)
# b = int(b)
# c = int(c)
# if a<b<c:
#     print(b)
# elif a<c<b:
#     print(c)
# elif b<a<c:
#     print(a)
# elif b<c<a:
#     print(c)
# elif c<a<b:
#     print(a)
# elif c<b<a:
#     print(b)
# elif a==b:
#     print(a)
# elif a==c:
#     print(a)
# elif b==c:
#     print(b)
# else:
#     print('')

# a, b = input().split()
# a=int(a)
# b=int(b)
# c=(90-a)//5+1
# if a%5 == 0:
#     print(b+c-1)
# else:
#     print(b+c)

a, b, c = input().split()
a=int(a)
b=int(b)
c=int(c)
if a > b and a > c:
    if b + c > a:
        print('yes')
    else:
        print('no')
elif b > c and b > c:
    if a + c > b:
       print('yes')
    else:
        print('no')
else:
    if a + b > c:
        print('yes')
    else:
        print('no')