The generator matrix

 1  0  1  1  1  1  1  1  1  0  1  1  1  1  1  1  1  1  X  1  1  1  1  X  1  1 3X  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1 2X 2X  1  1  1 4X  1  1  1  1  1 4X  1  1  1  1 4X  1  1  1 2X  1  1  1  1  X  1  1  1  1  1  0  0  1  1  1  1
 0  1  1  2 3X+4  3  0 3X+1  2  1 3X+4  3  X X+2 4X+4  X 3X+1 X+3  1 4X+1 X+2 4X+4 X+3  1  1 X+4  1  0  2  3 3X 3X+2 3X+3 3X 3X+2 3X+3 4X+1 X+1 2X+4 X+4  X 2X+2 3X+3  1  1 2X X+1 4X+4  1 4X+1  1 X+2 2X+4 X+3  1 3X 3X+2 2X+4 2X+3  1 2X 2X+2 X+4  1 2X+3 3X+1 4X 3X+1  1 X+2 3X+4 2X+3 4X 2X+2  1  X X+3 X+1 4X+4  0
 0  0 3X 2X  X  0 4X 2X  X 2X 3X 4X 2X 3X 4X  X  0 3X 4X  X 4X  0 2X 3X 4X 2X  X 3X  0  X 4X  X  0  X 4X 2X 2X 3X  0  X  0 2X 3X  0 2X 3X 4X 2X  X  0  X  0 3X 4X 4X 2X 3X 4X  X 3X  0  0 3X  X 4X 3X 4X 4X 2X 2X  0 2X 2X 3X 3X 4X  X  X  X  X

generates a code of length 80 over Z5[X]/(X^2) who´s minimum homogenous weight is 314.

Homogenous weight enumerator: w(x)=1x^0+680x^314+224x^315+1240x^319+252x^320+200x^324+60x^325+160x^329+40x^330+220x^334+44x^335+4x^340

The gray image is a linear code over GF(5) with n=400, k=5 and d=314.
This code was found by Heurico 1.16 in 0.0934 seconds.