#include <iostream>
#include <cmath>
using namespace std;
int main()
{
unsigned long long N;
while(cin>>N)
{
unsigned long long x=1;
for(unsigned long long n=2;n<=N;++n)
{
x*=n;
while(!(x%10)) x/=10;
x%=10;
}
cout<<N<<" ostatnia cyfra "<<x<<endl;
}
return 0;
}
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