Очень лёгкая задача

n, x, y = map(int, input().split())
if n == 1:
    print(min(x, y))
else:
    left = 0
    right = n * (x + y - min(x, y) + 1)
    while left < right - 1:
        center = (left + right) // 2
        if n - 1 <= center // x + center // y:
            right = center
        else:
            left = center
    print(left + min(x, y) + 1)