`M = x sqrt (((y+x)(y+z)(z+y)(z+x))/((x+y)(z+x))) + y sqrt (((z+y)(z+x)(z+x)(x + y))/((y+x)(y+z))) + z sqrt (((x+y)(x+z)(y+z)(y+x))/((z+x)(z+y)))`
`= x sqrt (y+z)^2 + ysqrt (x+z)^2 + z sqrt (x+y)^2`
`= xy + xz + yz + yz + zx + zy`
`= 2(xy+yz+zx)`
`= 2 xx 2013`
`= 4026`.