# https://codeforces.com/problemset/problem/1955/A

# line 1        : t = number of test cases
# line 2        : n, a, b

t = int(input())

for _ in range(t):
    n, a, b = [int(x) for x in input().split()]
    minimum_cost = (n // 2) * b + (n % 2) * a if a * 2 > b else n * a
    print(minimum_cost)