program main
    implicit none
    integer*8::n,m
    read*,n
    do m=1,n,1000
        if(2*n<(m+1000+1)*(m+1000))exit
    end do
    do while(2*n>(m+1)*m)
        m=m+1
    end do
    if(2*n==(m+1)*m)then
        print*,"YES"
        print*,n
    else
        print*,"NO"
    end if
end program