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#include <fstream>
using namespace std;
ifstream fin("fact.in");
ofstream fout("fact.out");
int nrzero(int n)
{
int nr0 = 0;
while(n >= 5){
nr0 += n / 5;
n /= 5;
}
return nr0;
}
int cb(int p)
{
int n = 0; pas = 1 << L;
while(pas != 0){
if(nrzero(n + pas) < p){
n += pas;
}
pas /= 2;
}
n++;
return m;
}
int main()
{
int r, pas, p;
fin >> p;
r = 0;
pas = 1 << L;
while(pas != 0){
if(nrzero(r + pas) < p){
r += pas;
}
pas /= 2;
}
r++;
if(nrzero(r) != p){
r = -1;
}
fout << r;
return 0;
}