Sum of Two Nums

a = int(input())
b = int(input())
c = int(input())
cnt = 0
flag=False
for i in range(a, b + 1):
    for j in range(a, b + 1):
        cnt += 1
        if i + j == c:
            print(f'Combination N:{cnt} ({i} + {j} = {c})')
            flag=True
            break
    if flag:
        break

if cnt == (b - a + 1) **2:
    print(f'{cnt} combinations - neither equals {c}')