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Cod sursa(job #238698)
#include<stdio.h>
#include<math.h>
int main(){
int p,k,p1;
long n;
freopen("fact.in", "r", stdin);
freopen("fact.out", "w", stdout);
scanf("%d",&p);
n=p*5;
k=0;
p1=5;
if(p==0){
printf("1");
return 0;
}
while(p1<=n){
p1=p1*5;
if(p1<=n)
k++;
//printf("%d %d\n",p1,k);
}
//printf("%d %d",p,n);
if(k!=0)
printf("%d",n-(k*5));
else
printf("%d",n);
return 0;
}