双变量比较基础且容易看懂

解题思路:一个变量用于累加，一个变量用于储存值

注意事项:

参考代码:

a,b,c = map(int,input().strip().split())

res_1 = 1

result_1 = 0

res_2 = 1

result_2 = 0

res_3 = 1

result_3 = 0

for i in range(a):

    result_1 += res_1

    res_1 += 1

for i in range(b):

    result_2 += res_2 ** 2

    res_2 += 1

for i in range(c):

    result_3 += (1/res_3)

    res_3 += 1

result = (result_1 + result_2 + result_3)

print(f'{result:.2f}')