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#include <fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
int main()
{
long long N,y,k,x,p;
f>>p;
N=4*p;
k=0;
y=5;
while (N/y>0)
{ k=k+N/y;
y=y*5;
}
if(k<p)
for(x=N+1;x<=p*5&&k<p;x++)
{ y=x;
while(y%5==0)
{
k++;
y=y/5;
}
}
if(p==0) g<<1;
else if(k==p) g<<x-1;
else g<<-1;
f.close();
g.close();
return 0;
}