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Cod sursa(job #29962)
#include<fstream>
using namespace std;
long int fact(long int x)
{
long int i,prod=1;
for(i=1;i<=x;i++)
prod=prod*i;
return prod;
}
int main()
{
long int n=1,prod,p,i,cnt,gasit=0;
ifstream f("fact.in");
ofstream g("fact.out");
f>>p;
while(!gasit){
cnt=0;
prod=fact(n);
for(i=1;i<=p;i++){
if(prod%10==0&&prod!=0){
cnt++;
prod/=10;
}
else
i=p;
}
if(cnt==p)
gasit=1;
else
n++;
}
g<<n;
f.close();
g.close();
return 0;
}