20221013

# 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 = map(int, input().split())
# a = bool(a)
# b = bool(b)
#
# # 0, None, [], (), {}
#
# print(a and b)
# print(a or b)
# print(not a)
# a=int(input())
# a=bool(a)
#
# print(a)

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

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

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

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

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

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

#
# '''             Answer      Your Code Result
# False   False:  True    >
# False   True:   False   >
# True    False:  False   >
# True    True:   False   >
#
# '''
#
# x, y = map(int, input().split())
#
# v = x - y if x > y else y - x
# # Condition ? AnswerA : AnswerB
#
# print(v)

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

v=x-y if  else

print(v)