#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k;
  cin >> n >> k;
  vector<int> res(n);
  for (auto &v : res) cin >> v;
  int sum = 0, mini = INT_MAX, index = -1, i;
  for (i = 0; i < n; i++) {
    if (i < k) {
      sum += res[i];
      continue;
    } else {
      if (mini > sum) {
        mini = sum;
        index = i;
      }
      sum -= res[i - k];
      sum += res[i];
    }
  }
  if (mini > sum) index = i;
  mini == INT_MAX ? cout << 1 : cout << (index - k + 1);
  return 0;
}
