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

#define int long long
#define rep(i, n) for(int i = 0; i < (int)(n); ++i)

int solve(void) {
    int N, X;
    cin >> N >> X;
    vector<int> A(N);
    rep(i, N) cin >> A[i];
    
    int Asum = 0;
    rep(i, N) Asum += A[i];
    
    cout << max(0LL, Asum - X) << "\n";
    
    return 0;
}

signed main(void) {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    
    int Testcases = 1;
    //cin >> Testcases;
    while(Testcases--) solve();
    
    return 0;
}