Cod sursa(job #354737)
Utilizator | Data | 9 octombrie 2009 12:07:39 | |
---|---|---|---|
Problema | Factorial | Scor | 100 |
Compilator | cpp | Status | done |
Runda | cautb1 | Marime | 0.41 kb |
#include<cstdio>
int zero(int n)
{
int nrzero=0;
while(n)
{
nrzero+=(n/=5);
}
return nrzero;
}
int cb(int p)
{
int i,pas=(1<<30);
for(i=0;pas;pas>>=1)
if(zero(i+pas)<=p-1)
i+=pas;
if(zero(i+1) != p)
return -1;
return i+1;
}
int main()
{
int nr,p;
freopen("fact.in","r",stdin);
freopen("fact.out","w",stdout);
scanf("%d",&p);
nr=cb(p);
printf("%d",nr);
return 0;
}