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#include <iostream>
#include <math.h>
using namespace std;
int main()
{
int P, nrc=0, nr=1;
float a;
cout<<"P=";cin>>P;
if(P==5)
{cout<<"NU EXISTA";
cout.flush();}
else
{
while(nrc!=P)
{
a=log(nr)/log(5);
if(a==int(a))
nrc=nrc+a;
else
if(nr%10==0 && nr/10%10%5!=0)
nrc++;
else
if(nr%5==0 && nr%10!=0)
nrc++;
else
if(nr%5==0 && nr%10==0)
nrc=nrc+2;
if(nrc!=P)
{if(nr==1)
nr=5;
else
nr=nr+5;}
}
cout<<nr;
cout.flush();
}
return 0;
}