#include <bits/stdc++.h>
using namespace std;
template <typename a>
void SWAP(a &b, a &c) {
  a d = b;
  b = c;
  c = d;
}
long long power(long long a, long long b) {
  long long result = 1;
  while (b) {
    if (b & 1) result = a * result;
    a *= a;
    b >>= 1;
  }
  return result;
}
long long gcd(long long a, long long b) {
  while (b) {
    a = a % b;
    SWAP(a, b);
  }
  return a;
}
long long lcm(long long a, long long b) { return (a * (b / gcd(a, b))); }
int main() {
  long long n, k;
  scanf("%lld %lld", &n, &k);
  long long h[n];
  long long sum = 0, ans = LLONG_MAX, index = 1;
  for (long long i = 0; i < n; i++) {
    scanf("%lld", &h[i]);
    sum += h[i];
    if (i + 1 >= k) {
      if (ans > sum) {
        index = i - k + 2;
        ans = sum;
      }
      sum -= h[i - k + 1];
    }
  }
  printf("%lld\n", (index));
  return 0;
}
