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

template<class T> istream& operator >> (istream& is, vector<T>& vec) {
    for(T& x : vec) is >> x;
    return is;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, x;
    cin >> n >> x;
    vector<int> a(n);
    cin >> a;
    cout << max(0, accumulate(a.begin(), a.end(), 0) - x) << '\n';
}