1*2*3*......*3000相乘结果的末尾有多少个0？

public class CountZeroDemo {
public static void main(String[] args) {
System.out.println(countZero(3000));//748
}
private static int countZero(int n){
int count=0;
int j;
for(int i=1;i<=n;i++){
j=i;
while(j%5==0){
count++;
j/=5;
}
}
return count;
}
}