#include<stdio.h>
int main(){
    int n,i;
    int min = 100000;
    scanf("%d",&n);
    if(n <= 0){
        printf("Invalid Input");
        return 0;
    }
    int arr[n];int min = 100000;
    for(i = 0;i < n; i++){
        scanf("%d", &arr[i]);
       if(arr[i] <= 0){
          printf("Invalid Input");
          return 0;
        }
       if(arr[i] < min){
          min = arr[i];
        }
    }
      printf("%d",min);
      return 0;
}