/*
TASK: bus
LANG: C++
*/

#include <iostream>
#include <cstdio>
#include <fstream>
#include <vector>
#include <cstdlib>
#define MAX 1024


using namespace std;

FILE *in; FILE *out;
int n, m;

int main(void)
{
int i, c;

//in = fopen("demo.in", "rt"); out = fopen("demo.out", "wt");
in = stdin; out = stdout;

fprintf(out, "Hello, world!\n");


//system("pause");
fclose(in); fclose(out);

return 0;
}
