N = int(input())

A_li = [0]
B_li = [0]

aa = bb = bsum = 0

for i in range(N):
	a,b = map(int,input().split())
	A_li.append(a)
	B_li.append(b)
	if a < b:
		aa += a
	else:
		bb += b
	bsum += b
	
		
ma = max(aa,bb)	
	
dp = [[0 for w in range(ma+1)] for i in range(N+1)]

for i in range(1,N+1):
	weight = A_li[i]
	value = B_li[i]
	for w in range(1,ma+1):
		if w < weight:
			dp[i][w] = dp[i-1][w]
		else:
			dp[i][w] = max(dp[i-1][w], (dp[i-1][w-weight]+value))
	
ans = 10**20	
	
	
for j in range(1,ma+1):
	ans1 = max(j, (bsum - dp[N][j]))
	ans = min(ans,ans1)
	
print(ans)