a, b = [int(i) for i in input().split()]

print(a%b) int(i) for i in input().split() for i in input().split() i input().split() ().split () input split for i in input().split() int(i) int i a, b = [int(i) for i in input().split()] a [int(i) for i in input().split()] b print(a%b) print a%b a b b = [int(i) for i in input().split()] [int(i) for i in input().split()] b a, b = [int(i) for i in input().split()] [int(i) for i in input().split()] a
a, b = [int(i) for i in input().split()]

print(a%b)