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Cod sursa(job #577114)
#include <fstream.h>
unsigned long p;
unsigned long long n, i, ii;
int main(){
freopen("fact.in", "r", stdin);
freopen("fact.out", "w", stdout);
scanf("%ld", &p);
if(p==0){
printf("1");
return 0;}
for(i=5;n<p;i+=5){
ii=i;
while(ii%10==0){
n++;
ii/=10;}
if(ii%25==0&&ii%75!=0)
n++;
if(ii%5==0)
n++;}
if(n==p)
printf("%lld ", i-5);
else
printf("-1");
return 0;
}