251012

# a = input()
# print(a)
# a = input()
# b = input()
# print(a)
# print(b)
# a, b = input().split()
# print(a)
# print(b)
# a, b = input().split(':')
# print(a, b, sep=':')
# a = input()
# print(a[0])
# print(a[1])
# print(a[2])
# print(a[3])
# print(a[4])
# a, b = input().split()
# s = a+b
# print(s)
# a = input()
# n = int(a)
# print('%x'%n)
# a = ord(input())
# print(a)
#a = ord(input())
# print(chr(a+1))
# a, b = input().split()
# print(a*int(b))
# a, b = input().split()
# n = float(a)
# m = float(b)
# print(n**m)
# print('\"C:\\Download\\\'hello\'.py\"')
# print('print(\"Hello\\nWorld\")')
# a = input()
# n = int (a)
# print(n)
# a = input()
# b = input()
# print(b)
# print(a)
# a = input()
# n = float(a)
# print(n)
# print(n)
# print(n)
# a, b = input().split()
# print(b, a)
# a = input()
# print(a, a, a)
# a, b, c = input().split('.')
# print(c, b, a, sep='-')
# a, b= input().split('-')
# print(a, b, sep='')
# s = input()
# print(s[:2], s[2:4], s[4:])
# a, b, c= input().split(':')
# print(b)
# a, b = input().split()
# n = int(a)+int(b)
# print(n)
# a = input()
# b = input()
# n = float(a)+float(b)
# print(n)
# a = int(input())
# n = a*-1
# print(n)
a, b = input().split()
c = int (a) - int(b)
print(c)