#include <stdio.h>
int main() {
    int n, i, num, smallest;
    
    scanf("%d, &n");
    
    if (n <= 0){
        printf("Invalid Input");
        return 0;
    }
    smallest = 100;
    
    for (i = 0; i < n; i++){
        scanf("%d", &num);
        
        if (num < 0){
            printf ("Invalid Input");
            return 0;
        }
        if (num < smallest)
        smallest = num;
    }
    printf("%d", smallest);
    return 0;
}