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#include <fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
int p;
int nrzero(int x)
{
int i,k=0,y;
for (i=1;i<=x;i++)
{
y=i;
while (y%5==0)
{
k++;
y/=5;
}
}
return k;
}
void rezolva()
{
int i=1,x;
do
{
x=nrzero(i);
i++;
}while (x!=p);
g<<i-1;
}
int main()
{
f>>p;
if (p==0)
{
g<<1<<'\n';
return 0;
}
else
rezolva();
return 0;
}