Cod sursa(job #1462073)
Utilizator | Data | 17 iulie 2015 00:29:42 | |
---|---|---|---|
Problema | Factorial | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.73 kb |
#include <fstream>
#include <iostream>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");
int main()
{
long long n,k=1,i,f=0,h=5,x=1;
cin>>n;
if(n==0)
{
cout<<"1";
return 0;
}
for(i=1;k<=n;i++)
{
k=5*k;
if(k==n)
{
cout<<"-1";
return 0;
}
if(k>n)
{
if(k<=5)
{
cout<<n*5;
return 0;
}
else
{
cout<<n*5-f;
}
return 0;
}
f=f+x*h;
x++;
}
cout<<"-1";
return 0;
}