75 + 6 = 81
7 x 50 = 350
50 x 81 = 4050
1 + 350 = 351
351 + 4050 = 4401

50 + 6 = 56
75 + 50 = 125
56 + 1 = 57
125 + 57 = 182
182 + 7 = 189