#include <stdio.h>
int main(void)
{
int i,n,j,r,s;
static int k=2;
r=n;
for(i=1;i<=n;i++)
{ r=r-1;
for(j=0;j<i;j++)
{
s=r;
while(s--)
{
}
k=k+2;
}
}
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgoKaW50IG1haW4odm9pZCkgCnsKICAgIGludCBpLG4saixyLHM7CiAgICBzdGF0aWMgaW50IGs9MjsKICAgIAoJc2NhbmYoIiVkIiwmbik7CglyPW47Cglmb3IoaT0xO2k8PW47aSsrKQoJeyAgcj1yLTE7CgkgICAgZm9yKGo9MDtqPGk7aisrKQoJICAgIHsKCSAgICAJcz1yOwoJICAgIAl3aGlsZShzLS0pCgkgICAgCXsKCSAgICAJCXByaW50ZigiICIpOwoJICAgIAl9CglwcmludGYoIiU1LjVkICIsKGsqKDIqay0xKSkpOwoJaz1rKzI7CgkgICAgICAgIAoJICAgIH0KCSAgICBwcmludGYoIlxuIik7Cgl9CglyZXR1cm4gMDsKfQo=