package com.x.xyz;

public class HelloWorld {

	public static void main(String[] args) {
		System.out.println("Star !");
		System.out.println(trailingZeroes(10));
		System.out.println(trailingZeroes(125));
		System.out.println(trailingZeroes(25));
		System.out.println(trailingZeroes(3));
		System.out.println(trailingZeroes(4));
		System.out.println(trailingZeroes(5));
		System.out.println(trailingZeroes(6));
		System.out.println(trailingZeroes(7));
	}
	
	public static int trailingZeroes(int n) {
		int x = 5;
		int ans = 0;
		while(n >= x) {
			ans = ans + n/x;
			x = x*5;
		}
		return ans;
	}
}

172 Factorial Trailing Zeroes 过了。英文真不好读啊。