#include <stdio.h>
int find_pattern(int *mem, int n) {
// Write your pointer-based logic here
int *p=mem;
int *base=p;
while(p < mem+n){
if(*(p+1) == *p + 1 && *(p+2)==*p+2){
return p-base;
}
p++;
}
return -1;
}
int main() {
int n, arr[100];
scanf("%d", &n);
for (int i = 0; i < n; i++) {
scanf("%d", &arr[i]);
}
int res = find_pattern(arr, n);
printf("%d", res);
return 0;
}