#include<fstream>
using namespace std;
int a ,n ,k ,aux,v[1000], i,c,j,p,s,x,q,r,b,suma,sum;
ifstream fin("fact.in");
ofstream fout("fact.out");
int main(){
    fin >> n;
    i = 5;
    while(k < n){
        if(i % 25 == 0)
            k = k + 2;
        else
         k++;
         if(k >= n)
         fout<<i;

         i = i + 5;
         //fout<<i<<" ";
    }
    //fout<<i
}