Cod sursa(job #2428561)

Utilizator NMadrianNechiti Mihai Adrian NMadrian Data 5 iunie 2019 19:28:56
Problema Factorial Scor 30
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.34 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std ;
ifstream cin ("fact.in");
ofstream cout ("fact.out");
int main (){
long long p , n;
long long m=0, c=0;
cin >> p ;

if(p==0)
    cout<<1;
else
{while (p>0)
{m=0;
    c+=5;
    n=c;
    while(n%5==0)
        n/=5,m++;
    p-=m;
}
if(p==0)
cout<< c;
else
    cout<<"-1";
}
return 0 ;
}