#include <bits/stdc++.h>
#include <cassert>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(n);i++)

int main(){
    int n, x;
    cin >> n >> x;
    assert(1<=n && n<=100);
    assert(0<=x && x<=10000);
    vector<int> a(n);
    rep(i,n){
        cin >> a[i];
        assert(0<=a[i] && a[i]<=1000);
    }

    int sum = 0;
    rep(i,n) sum += a[i];
    cout << (sum<=x? 0 : sum-x) << endl;

}