#输入部分
grade1 = eval(input())
score1 = eval(input())
grade2 = eval(input())
score2 = eval(input())
grade3 = eval(input())
score3 = eval(input())
#输出部分
score = (grade1 * score1 + grade2 * score2 + grade3 * score3) * 1.0/(grade1 + grade2 +grade3)
print("{:.4f}".format(score))
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