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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,M; cin >> N >> M;
    priority_queue<pair<long long,int>,vector<pair<long long,int>>,greater<>> Q;
    vector<long long> T(M);
    for(int i=0; i<M; i++) Q.push({0,i});
    while(N--){
        int a; cin >> a;
        auto [ign,pos] = Q.top(); Q.pop();
        T.at(pos) += a;
        Q.push({T.at(pos),pos});
    }

    cout << *max_element(T.begin(),T.end()) << endl;
}