#include <stdio.h>
#include <math.h>
main()
{
int n , i, sum=0;
for(i=3;i<=n;i+2)
{
}
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CiNpbmNsdWRlIDxtYXRoLmg+Cm1haW4oKQp7CiAgICAgaW50IG4gLCBpLCBzdW09MDsKCiAgICBzY2FuZigiJWQiLCAmbik7CgogICAgZm9yKGk9MztpPD1uO2krMikKICAgIHsKICAgICAgICBzdW0gPSBzdW0gKyBwb3coaSw1KTsKICAgIH0KICAgIHByaW50ZigiJWQiLCBzdW0pOwoKICAgIHJldHVybiAwOwp9Cg==