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Cod sursa(job #215070)
#include<stdio.h>
//0 2 10
int main()
{
FILE *in, *out;
int N=0, P, c5=0, i;
in=fopen("fact.in", "r");
out=fopen("fact.out", "w");
fscanf(in, "%d", &P);
if (P==0) fprintf(out, "%d", 1);
else
{
while (c5<P)
{
N+=5;
i=N;
while (i%5==0)
{
i/=5; c5++;
if (c5==P) break;
}
}
if(!c5) fprintf(out, "%d", -1);
else fprintf(out, "%d", N);
}
return 0;
}