[编程入门]求和训练-题解(Python代码)

a, b, c = map(int, input().split())
sn1 = 0
for i in range(1, a + 1):
    sn1 += i
sn2 = 0
for i in range(1, b + 1):
    sn2 += i * i
sn3 = 0
for i in range(1, c+1):
    sn3 += 1 / i
print("{:.2f}".format(sn1 + sn2 + sn3))