#include <bits/stdc++.h> using namespace std; int main() { int n, m; cin >> n >> m; int a[3005]; for (int i = 0; i < n; i++) { cin >> a[i]; } if (m == 0) { cout << 0 << endl; return 0; } int min_sum = INT_MAX; for (int i = 0; i <= n - m; i++) { int sum = 0; for (int j = i; j < i + m; j++) { sum += a[j]; } if (sum < min_sum) { min_sum = sum; } } cout << min_sum << endl; return 0; }