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Cod sursa(job #751984)
#include<fstream>
using namespace std;
ofstream out("fact.out");
int p;
int numar(int);
int main()
{
ifstream in("fact.in");
in>>p;
int mid,st=1,dr=5*p;
while(st<=dr)
{
mid=(st+dr)/2;
if(numar(mid)>=p)
dr=mid-1;
else
st=mid+1;
}
if(numar(st)==p)
out<<st<<" ";
else
out<<-1;
return 0;
}
int numar(int x)
{
int nrc=0,pp=5;
while(pp<=x)
{
nrc+=x/pp;
pp*=5;
}
return nrc;
}