#include<bits/stdc++.h>
using namespace std;
int n,k,a[150010],b[150010],minj,mini=INT_MIN;
int main()
{
    cin>>n>>k;
    for(int i=1;i<=n;i++){
        cin>>a[i];
        b[i]=a[i]+b[i-1];
    }
    for(int j=1;j<=n-k;j++){
        int o=b[j+k-1]-b[j-1];
        if(o<mini){
            minj=j;
            mini=o;
        }
    }
    cout<<minj;
    return 0;
}