Cod sursa(job #215064)
Utilizator | Oprea Mihai mihaio07 | Data | 17 octombrie 2008 15:14:15 |
---|---|---|---|
Problema | Factorial | Scor | 0 |
Compilator | c | Status | done |
Runda | Arhiva de probleme | Marime | 0.61 kb |
#include<stdio.h>
//0 2 10
int main()
{
FILE *in, *out;
int N=0, P, c5=0, i, adev=1;
in=fopen("fact.in", "r");
out=fopen("fact.out", "w");
fscanf(in, "%d", &P);
while (c5<P)
{
N+=5;
i=N;
while (i%5==0)
{
i/=5; c5++;
if (c5==P) { adev=0; break; }
}
}
if(!c5) fprintf(out, "%d", -1);
else
{
if (!adev) fprintf(out, "%d", -1);
else fprintf(out, "%d", N-5);
}
return 0;
}
5 5^2
5^2 5^3