#include<iostream>
#include<vector>
using namespace std;

int main(){
    int N,X;
    cin >> N >> X;
    vector<int> A(N);
    for(int i = 0; i < N; i++)cin >> A[i];
    int Asum = 0;
    for(int i = 0; i < N; i++)Asum += A[i];
    if(Asum <= X)cout << 0 << endl;
    else cout << Asum-X << endl;
    return 0;
}