g='a=b%(b=a),a?g:b'
read l
for((l/=4,i=2;i*i*2<l;++i)){
for((j=i%2+1;j<i&i*(i+j)*2<=l;a=i,b=j,z+=g<2,j+=2)){
:
}
}
echo $[z+0]