N = 625
[C1] non-units [C2] #non-units lead to same
#solution for discriminant		 [C3] #solution for discriminant
= non-units in C1
75, 200, 50, 325, 175, 450, 575, 550, 300, 425 10 1750
500, 0, 375, 125, 250 5 1125
5, 115, 170, 610, 535, 220, 440, 180, 455, 415, 120, 60, 460, 275, 270, 140, 355, 280, 90, 70, 100, 135, 385, 475, 320, 465, 530, 105, 620, 540, 55, 305, 485, 45, 240, 35, 520, 505, 20, 295, 330, 95, 580, 565, 80, 345, 110, 595, 290, 245, 560, 410, 405, 335, 230, 315, 65, 185, 195, 260, 615, 130, 145, 600, 590, 265, 400, 585, 150, 395, 15, 480, 155, 215, 570, 85, 225, 10, 495, 510, 25, 350, 445, 340, 30, 515, 605, 435, 40, 525, 205, 430, 190, 470, 160, 360, 545, 365, 380, 255, 490, 420, 235, 285, 555, 165, 370, 310, 210, 390 110 500
C2TC3 = #ways delta can be non-unit 78125
Total non-singular EC over Z625 = 6252 - #ways delta can be non-unit (C2TC3) = 312500