【PY3】卡三个点，遇到了历史遗留问题（？），有没有佬帮忙康一下，求求了！

n = int(input())
menu = []
for i in range(n):
    menu.append(list(map(int, input().split())))

answer = 99999999999

def dfs(depth,sour,bitter):
   
    global answer,menu,n
    fla = abs(sour-bitter)
    if answer > fla and sour!=1:
        answer = fla

    for i in range(depth,n):
        sour*=menu[i][0]
        bitter+=menu[i][1]
        depth+=1
        dfs(depth,sour,bitter)
        sour//=menu[i][0]
        bitter-=menu[i][1]
        depth-=1
dfs(0,1,0)
print(answer)
'''
如果我们输入：
7
7 1297
9 1230
4 5780
4 1235
3 7652
8 979
10 977
则会得到：41
'''