#include <stdio.h>

int main() {
    // n个中奖号码
    int n;
    scanf("%d", &n);
    int s[100] = {0};
    for (int i = 0; i < n; ++i) {
        scanf("%d", &s[i]);
    }
    int x;
    scanf("%d", &x);

    int flag = 0;
    for (int j = 0; j < n; ++j) {
        if (s[j] == x) flag = j + 1;
    }
    flag ? printf("%d\n", flag) : printf("0\n");
    return 0;
}