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Cod sursa(job #382825)
#include<stdio.h>
#include<stdlib.h>
int main()
{
int p,q,fact,c=0;
freopen("fact.in","r",stdin);
freopen("fact.out","w",stdout);
scanf("%d",&p);
int z=1;
for(int i=1;i<=p;i++)
z*=10;
for(int i=1; i<=1000;i++)
{
fact=1;
c++;
for(int j=1; j<=i;j++)
{
fact*=j;
}
if(fact%z==0)
{
q=0;
break;
}
}
if(q==0)
printf("%d",c);
else
printf("-1");
fclose(stdin);
fclose(stdout);
return 0;
}