#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fin.in");
ofstream fout("fout.out");
void Input()
{
;//please written at here
}
void algorithm()
{
;//please written at here
}
void Output()
{
;//please written at here
}
int main()
{
Input(); //输入
algorithm(); //算法
Output(); //输出
}
