#include <stdio.h>

int main()
{
    FILE *fin = fopen("fact.in", "r");
    FILE *fout = fopen("fact.out", "w");
    int P;
    fscanf(fin, "%d", &P);
    if (P < 1)
    {
        fprintf(fout, "%d", 1);
    }
    else
    {
        int rez = 0;
        int i;
        for (i = 0; i < P; ++i)
        {
            rez += 5;
        }
        fprintf(fout, "%d", rez);
    }
    fclose(fin);
    fclose(fout);
    return 0;
}