#include<stdio.h>
#include<stdio.h>
int main(){
    int n, num, i;
    double min =INFINITY;
    scanf("%d\n", &n);
    
    for(i = 0; i<n; i++){
        scanf("%d",&num);
        if(num <= 0){
            printf("Invalid Input");
            return 0;
            
        }else {
            if(num<= min){
                min = num;
                
            }
        }
    }
    printf("%.1f",min);
    return 0;
    
}