/*
#include <stdio.h>
#include <stdlib.h>
int main()
{
printf("Hello world!\n");
return 0;
}
*/
/*
#include <stdio.h>
#include <string.h>
int main()
{
char a[201]= {0};
int i,j,n;
scanf ("%d",&n);
scanf ("%s",a);
for(i=0; i<=n; i++)
{
if((n-i)%3==0)
{
printf ("%s",a);
}
}
}
*/
/*
#include <stdio.h>
int stack[5] = {0}, top = 0;
void input(int k)
{
if(top == 5)
{
printf ("Stack is Full\n");
return ;
}
stack[top] = k;
top++;
}
void output()
{
if(top==0)
{
printf ("Stack is Empty\n");
}
}
void view()
{
int i;
for(i=0; i<5 ;i++)
{
printf ("%d : %d\n", i, stack[i]);
}
}
int main()
{
int k,n,i;
for(;;)
{
printf ("1:input, 2:output, 3:view>");
scanf ("%d",&n);
switch(n)
{
case 1:
printf ("input data");
scanf ("%d",&k);
int k;
break;
case 2:
output ();
break;
case 3:
view();
break;
default:
printf ("inptu erropr");
break;
}
}
}
*/