If the boiling points of two solvents X and Y (having same molecular weights) are in the ratio $2: 1$ and their enthalpy of vaporizations are in the ratio $1: 2$, then the boiling point elevation constant of $\mathrm{X}$ is $\underline{\mathrm{m}}$ times the boiling point elevation constant of Y. The value of m is ____________ (nearest integer)