#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n,k;
    cin>>n>>k;
    int arr[n];
    for(int i=0;i<n;i++){
        cin>>arr[i];
    }
    long int answer=0;
    if(k==0){
        for(int i=0;i<n;i++)
            answer+=arr[i];
        cout<<answer<<"\n";
        return 0;
    }
    else
        cout<<answer;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}