SOLUTION OF URI 1789

//   Solution of   1789 The Race of Slugs
//   (Mahmud_Jamil) BRUR






#include <stdio.h>
int main()
{
    int a,b,c,d,e,f,max=0;
    while(scanf("%d",&a)!=EOF)
    {
        for(b=1,max=0; b<=a; b++)
        {
            scanf("%d", &c);
            if(c>max)
                max=c;
        }
        if(max<10)
            printf("1\n");
        else if(max<20)
            printf("2\n");
        else
            printf("3\n");
    }
    return 0;
}