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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 = 0; j < m; j++) sum += a[i + j];
MIN = min(MIN, sum);
}
cout << MIN << endl;
return 0;
}