A Young’s double slit interference arrangement with slits S₁ and S₂ is immersed in a liquid (refractive index = 1.4) as shown in the figure. The positions of the maxima on the surface of liquid are given by 𝑥² = (25/𝑝)${\mathrm{m}}^2{\mathrm{\lambda }}^2-{\mathrm{d}}^2$, where 𝜆 is the wavelength of light in air (refractive index = 1), 2𝑑 is the separation between the slits and 𝑚 is an integer. The value of 𝑝 is ______.