#include using namespace std; #define lint long long #define P pair #define LLP pair #define REP(i, x, n) for(int i = (x), i##_len = (int)(n) ; i < i##_len ; ++i) #define rep(i, n) for(int i = 0, i##_len = (int)(n) ; i < i##_len ; ++i) #define repr(i, n) for(int i = (int)(n) - 1 ; i >= 0 ; --i) #define SORT(x) sort((x).begin(), (x).end()) #define SORT_INV(x) sort((x).rbegin(), (x).rend()) const int IINF = (1 << 30) - 1; const long long LLINF = 1LL << 61; const long long MOD = 1000000007LL; const int dx4[] = {1, 0, -1, 0}, dy4[] = {0, 1, 0, -1}; const int dx8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dy8[] = {0, -1, -1, -1, 0, 1, 1, 1}; const double EPS = 1e-8; int main(){ cin.tie(0); ios::sync_with_stdio(false); int n, m; cin >> n >> m; cout << n - m << endl; return 0; }