CodeForces - 560A Currency System in Geraldion

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<ctype.h>
using namespace std;
int str[10000];
int main() {
int n, tag = 0;
scanf("%d", &n);
for (int i = 0; i < n; i++) {
scanf("%d", &str[i]);
if (str[i] == 1) tag = 1;
}
if (tag) printf("-1\n");
else printf("1\n");
return 0;
}