#include<iostream.h>
#include<stdio.h>
#include<conio.h>
#include<graphics.h>
int main(){
int driver=DETECT,mode=0;
initgraph(&driver,&mode,"c:\\tc\\bgi");
clrscr();
int r;
cin>>r;
clrscr();
circle(400,300,r);
getch();
return 0;
}