#include<stdio.h>
#include<stdlib.h>
#define max(a,b) \
   ({ __typeof__ (a) _a = (a); \
       __typeof__ (b) _b = (b); \
     _a > _b ? _a : _b; })

int main(){
    int n = 0, k = 0;
    long max_sum = 0, current_sum = 0;
    int index = 0;
    long value;
    scanf("%d%d",&n,&k);
    long* arr = (long*)malloc(k*sizeof(long));
    while(index < k && 1 == scanf("%ld",&arr[index])){
        current_sum += arr[index];
        index++;
    }

    int ans = 0;
    int arr_index = 0;
    index = 1;
    max_sum = current_sum;
    while(1 == scanf("%ld",&value)){
        current_sum = current_sum - arr[arr_index] + value;
        arr[arr_index] = value;
        if(current_sum > max_sum){
            max_sum = current_sum;
            ans = index;
        }
        arr_index = (arr_index+1)%k;
        index++;
    }
    printf("%d",ans);
    free(arr);
    return 0;
}