/*
#include<stdio.h>
int main ()
{
int a, b, c;
scanf ("%d %d", &a, &b);
if (b>a)
{
for (c=a; c<=b; c++)
printf ("%d ", c);
}
else
{
for (c=b; c<=a; c++)
printf ("%d ",c);
}
return 0;
}
*/
/*
#include<stdio.h>
int main ()
{
char a, b, c;
scanf ("%c %c", &a, &b);
if (b>a)
{
for (c=a; c<=b; c++)
printf ("%c ", c);
}
else
{
for (c=b; c<=a; c++)
printf ("%c ",c);
}
return 0;
}
*/
/*
#include<stdio.h>
int main ()
{
double a, b, c;
scanf ("%lf %lf", &a, &b);
for (c=a; c<=b; c+=0.01)
printf ("%.2lf ", c);
return 0;
}
*/
/*
#include<stdio.h>
int main ()
{
int a, b, c;
scanf ("%d %d", &a, &b);
for (c=a; c<=b; c++)
{
if(c%2==1)
{
printf ("%d ", c);
}
}
return 0;
}
*/
/*
#include<stdio.h>
int main ()
{
int a, b, c=0;
scanf ("%d", &a);
for (b=1; b<=a; b++)
{
c=c+b;
}
printf ("%d", c);
return 0;
}
*/
/*
#include<stdio.h>
int main ()
{
int a, b,c=0;
scanf ("%d", &a);
for (b=1; b<=a; b++)
{
if(b%2==0)
{
c=c+b;
}
}
printf ("%d", c);
return 0;
}
*/
/*
#include<stdio.h>
int main ()
{
int a, b,c=0,d;
scanf ("%d %d", &a,&b);
for (d=a; d<=b; d++)
{
if(d%3==0)
{
c=c+d;
}
}
printf ("%d", c);
return 0;
}
*/
#include <stdio.h>
int main()
{
int a, b;
scanf("%d", &a);
???
}