#include <stdio.h>
int main ()
{
    int n;
    scanf ("%d",&n);
    int number [n-1];
    for (int i=0;i<n;i++)
    {
        scanf ("%d",&number[i]);
    }
    int min =2147483647;
    for (int i=0;i<n;i++)
    {
        if (number [i]<min) min=number[i];
    }
    if (min<n)
    printf ("%d",min);
    else 
    printf ("%d",n);
    
    
    return 0;
}