#include <stdio.h>
int main() {
    int n;
    scanf("%d", &n);
    
    if (n <= 0) {
        printf("Invalid Input");
        return 0;
    }
    
    int arr[n];
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
        if (arr[i] < 0) {
            print("Invalid Input");
            return 0;
        }
    }
    
    int min = 101;
    for (int i = 0; i < n; i++) {
        if (arr[i] > 0 && arr[i] < min) {
            min = arr[i];
        }
    }
    printf("%d", min);
    
    return 0;
}