#include <fstream>

/*
const unsigned int NUM_MAX_SIZE = 12;

struct Numar {
    char n[NUM_MAX_SIZE];
    unsigned int nr_size;
};
*/

using namespace std;

int main (void)
{
    ifstream f_in("fact.in");
    ofstream f_out("fact.out");
    
    unsigned long long P;
    f_in>>P;
    f_in.close();
    
    P *= 5;
    f_out << P << '\n';
    f_out.close();
}