yuanshenqidong

#include <iostream>
#define yuanshen using
#define qidong namespace
#define mihoyo std
#define genshin int
#define impact main
#define ys for
#define qd if
#define yuanshenqidong cin
#define yuanshenxiezai cout
yuanshen qidong mihoyo;
genshin impact()
{
    genshin y,sqd=0;
    yuanshenqidong>>y;
    ys(genshin q=1;q<=y;q++)
    {
        ys(genshin d=2;d<=y;d++)
        {
            genshin ysqd=y-q-d;
            qd(q<d&&d<ysqd&&q+d+ysqd==y) sqd++;
    	}
    }
    yuanshenxiezai<<sqd;
}