'''
def gcd_sub(a, b):
while a * b != 0:
if a > b:
a = a - b
else:
b = b - a
return a + b
def gcd_mod(a, b):
while a*b!=0:
if a>b:
a=a%b
else:
b=b%a
return a+b
def gcd_rec(a, b):
if a == 0:
return b
return gcd_rec(b % a, a)
a, b = input().split()
a = int(a)
b = int(b)
x = gcd_sub(a, b)
y = gcd_mod(a, b)
z = gcd_rec(a, b)
print(x, y, z)
'''
'''
def sum(a, b):
while a*b!=0:
if a>b:
a=a-b
else:
b=b-a
return a+b
a, b = input().split()
a = int(a)
b = int(b)
x = sum(a, b)
print(x)
'''
'''
def rec(a):
if a == 0:
return
rec(a-1)
print(a)
def pibo(a):
if a <= 2:
return 1
return pibo(a-2) + pibo(a-1)
print(pibo(7))
'''
'''
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(b >= a)
'''
'''
a, b = input().split()
a = int(a)
b = int(b)
print(a != b)
'''
'''
a, b = input().split()
a = bool(int(a))
b = bool(int(b))
print(a)
print(b)
'''
'''
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 ((a and (not b)) or ((not a) and b))
'''
'''
a, b = input().split()
a = bool(int(a))
b = bool(int(b))
print (((not a) and (not b)) or (a and b))
'''
'''
a, b = input().split()
a = bool(int(a))
b = bool(int(b))
print((not a) and (not b))
'''
'''
a, b, c = input().split()
a = bool(int(a))
b = bool(int(b))
c = bool(int(c))
print((a and b and (not c) or (a and (not b) and c) or ((not a) and b and c)))
'''
'''
a = input()
if a == "A":
print('best!!!')
elif a == "B":
print('good!!')
elif a == "C":
print("run!")
elif a == "D":
print('slowly~')
else:
print('what?')
'''
'''
a, b, c = input().split()
a = int(a)
b = int(b)
c = int(c)
if a + b > c:
if a == b and b == c and c == a:
print('정삼각형')
elif a == b or b == c or a == c:
print('이등변삼각형')
elif (a * a + b * b == c * c) or (a * a + c * c == b * b) or (c * c + b * b == a * a):
print('직각삼각형')
else:
print('삼각형')
else:
print('삼각형아님')
'''
a = int(input())
b = a / 10
c = a % 10
n = ((c*10 + b)*2)
print(n)
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