#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main()
{
    FILE *f = fopen("cifra.in" , "rt");
    FILE *g=  fopen("cifra.out" , "wt");
    long long  nr=1, s=0;
    int n, i, j,k , v[100];
    char c[10000];
    int c1, c2, c3;

    for(k=0;k<=100;k++)
    {
        s=0;
        for(i=1;i<=k;i++)
        {
            nr=1;
            for(j=1;j<=i;j++)
                {
                nr=nr*i;
                nr=nr%100;
                }
            s+=nr;
            s=s%10;
        }
    v[k]=s;
    }

    while(!feof(f))
    {
        c1=0;
        c2=0;
        fgets(c , 10000 , f);
        if(strlen(c)<=2)
            c3=c[strlen(c)-2]-'0';
        else
        {
            c1=c[strlen(c)-2]-'0';
            c2=c[strlen(c)-3]-'0';
            c3=c2*10+c1;
        }
        fprintf(g , "%d" , v[c3]);
    }
    fclose(f);
    fclose(g);
    return 0;
}