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Cod sursa(job #545966)
#include<iostream.h>
#include<fstream.h>
int main()
{
ifstream f;
f.open("fact.in");
ofstream g;
g.open("fact.out");
int p, l=0, i=1;
f>>p;
int ok=0;
while(!ok)
{
int aux=i;
if (aux%5==0)
while(aux%5==0)
{
l++;
aux/=5;
}
if (l>=p) ok=1;
else i++;
}
if(l==p) g<<i;
else g<<-1;
f.close();
g.close();
return 0;
}