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#include <bits/stdc++.h>
#define pb push_back
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
int p,poww,i,x,ok,s,v[15];
int main()
{
f>>p;
poww=1;
for(i=1; i<=12; i++)
{
poww*=5;
v[i]=poww;
}
x=p*5;
ok=1;
while(ok)
{
s=0;
for(i=1; i<=12&&v[i]<=x; i++)
s+=x/v[i];
if(s==p)
{
g<<x;
ok=0;
}
else if(s<p)
{
g<<-1;
ok=0;
}
else
x-=5;
}
return 0;
}