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

#define rep(i, a, b) for (ll i = a; i < b; i++)
using ll = long long;

int main(){
    int n, x;
    cin >> n >> x;
    int s = 0;;
    rep(i, 0, n) {
        int a;
        cin >> a;
        s += a;
    }
    int ans = 0;
    if(s > x) ans = s - x;
    cout << ans << endl;
}