#include <stdio.h>
int main(void)
{
int a[100];
int n;
int search;
int i;
int min;
int answer;
scanf("%d", &n);
    for(i = 0; i < n; i++)
    {
        scanf("%d", &a[i]);
    }
scanf("%d", &search);
min = (a[0] - search) * (a[0] - search);
answer = 0;
for(i = 1; i < n; i++)
{
int diff;
diff = (a[i] - search) * (a[i] - search);
if(diff < min)
{
min = diff;
answer = i;
}
}
printf("%d番目の値がもっとも近い\n", answer + 1);
return 0;
}

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