FE = 31
aa = 6/30 * 100 + 12/30 * 90 + 12/30 * 97.22
ea = 20/70 * 69 + 50/70 * FE
aw = 0
if ea >= 55:
    aw = 30
elif 40 <= ea and ea < 55:
    aw = ea - 25
else:
    aw = 15

ew = 100 - aw
grade = aw/100 * aa + ew/100 * ea

print(grade)