N = int(input())
src = [tuple(map(int,input().split())) for i in range(N)]

MAX = 1000
mem = [(0,0)]
for a,b in src:
    mem2 = []
    for ma,mb in mem:
        mem2.append((ma+a,mb))
        mem2.append((ma,mb+b))
    if len(mem2) > MAX:
        mem = sorted(mem2, key=lambda x:max(x))[:MAX]
    else:
        mem = mem2

print(min([max(a,b) for a,b in mem]))