#include<stdio.h>intmain(){int N, M;scanf("%d%d",&M,&N);printf("%d\n", M - N);return0;}
#include<iostream>usingnamespace std;intmain(){int N, M; cin >> N >> M; cout << N - M << endl;return0;}
let input =require("fs").readFileSync("/dev/stdin","utf8");let lines =input.split("\n");letN=parseInt(lines.shift());letM=parseInt(lines.shift());console.log(N-M);