UVA 568 - Just the Facts

#include<cstdio>
int main() {
int num , tem , sav;
while( scanf("%d",&num) != EOF ) {
for( sav = 1 ,tem = 1; tem <=num ; tem++ ) {
sav *= tem;
while( !(sav %10))
sav /= 10;
sav = sav%100000;
}
while( !(sav%10) )
sav /=10;
sav = sav%10;
printf("%5d -> %d\n",num,sav);
}
return 0;
}