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tedaddros = int(input("tedad dars hat ra vard kon : "))


drs = tedaddros
i = 0
vahed2 = 0

while i <= drs :
    esmdars = input("asm darst ra vard kon : ")
    nomre = int(input("nomret ra vard kon : "))
    vahed = int(input("vahed darst ra vard kon : "))
    sum = nomre * vahed
    vahed2 = vahed2 + vahed
    i = i + 1
    a = []
    size = drs
    for i in range(size) :
        val = nomre
        a.append(val)
    i = i + 1
max =a(0)
for i in range(size) :
    if(a[i] > max ) :
        print("max number :", max )

Moadel = sum / vahed2