#include <bits/stdc++.h>
using namespace std;
int main(){
    long long N, M;
    cin >> N >> M;
    vector<long long> A(N);
    for(int i = 0; i < N; i++) cin >> A[i];
    long long ub = 1000000000000000000, lb = 0;
    while(ub - lb > 1){
        long long mid = (ub + lb) / 2;
        vector<long long> B = A;
        for(int i = 0; i < N; i++) B[i] -= mid;
        long long temp = 0;
        bool f = true;
        for(int i = 0; i < N; i++){
            temp += B[i];
            if(temp < 0) f = false;
        }
        if(f) lb = mid;
        else ub = mid;
    }
    cout << lb / M << endl;
}