#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    int N, X; cin >> N >> X;
    int sum = 0;
    for (int i = 0; i < N; i++) {
        int a; cin >> a;
        sum += a;
    }
    int ans = 0;
    if (sum > X) ans = sum - X;
    cout << ans << endl;
}