notpassGread = []
passGread = []
for i in range(20):
    gread = int(input("Enter gread: "))
    if gread < 60:
        notpassGread.append(gread)
    else:
        passGread.append(gread)
print("the number of stusned that pass is :{}".format(len(passGread)))
print("the number of stusned that don't pass is :{}".format(len(notpassGread)))
print("avrege of passing gread: {}".format(passGread.sum/len.passGread))