$\mathrm{M}$ grams of steam at ${100}^{\mathrm{o}}\mathrm{C}$ is mixed with $200\mathrm{}\mathrm{g}$ of ice at its melting point in a thermally insulated container. If it produces liquid water at ${40}^{\mathrm{o}}\mathrm{C}$ [heat of vaporization of water is $540\mathrm{c}\mathrm{a}\mathrm{l}/\mathrm{g}$ and heat of fusion of ice is $80\mathrm{c}\mathrm{a}\mathrm{l}/\mathrm{g}$ ], the value of $\mathrm{M}$ is ________