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#include <bits/stdc++.h>
using namespace std;
const int N=3010;
const int INF=0x3f3f3f3f;
typedef long long LL;
int a[N];
LL MIN = INF;
int main() {
int n,m;
cin>>n>>m;
for (int i = 1; i <= n; i++) cin>>a[i];
for (int i = 1; i <= n-m+1; i++) {
LL sum =0;
for (int j = 1; j < m; j++) sum+=a[i+j];
MIN=min(MIN,sum);
}
cout<<MIN;
return 0;
}