Cod sursa(job #805437)
Utilizator | Ionescu Teodor teoionescu | Data | 31 octombrie 2012 14:52:21 |
---|---|---|---|
Problema | GFact | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.47 kb |
#include <fstream>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");
int zero(int n){
int nr=0;
while(n>=5){
nr+=n/5;
n /= 5;
}
return nr;
}
int caut(int x){
int i=0, pas = 1 <<30;
while(pas!=0){
if(zero(i+pas)<x) i+=pas;
pas /=2;
}
return 1+i;
}
int main()
{
int p,n;
in>>p;
n=caut(p);
if(zero(n)==p) out<<n<<"\n";
else out<<"-1\n";
return 0;
}