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#include<fstream>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");
int zero(int n)
{
int nr=0;
while(n>=5){
nr+=n/5;
n/=5;}
return nr;
}
int cb(int p)
{
int i=0,pas=1<<30;
while(pas!=0)
{
if(zero(i+pas)<p)i+=pas;
pas/=2;
}
return 1+i;
}
int main()
{
int n,i,p,a;
in>>p;
if(cb(p)==0)out<<-1;
else out<<cb(p);
return 0;
}