N = int(input())
AB = [tuple(map(int, input().split())) for _ in range(N)]
dp = [[0]*(1000*N+1) for _ in range(N+1)]

for i in range(N):
    Ai, Bi = AB[i]
    
    for j in range(1000*N+1):
        dp[i+1][j] = max(dp[i+1][j], dp[i][j])
        
        if j-Ai>=0:
            dp[i+1][j] = max(dp[i+1][j], dp[i][j-Ai]+Bi)

B = sum(Bi for _, Bi in AB)
ans = 10**18

for i in range(1000*N+1):
    ans = min(ans, max(i, B-dp[N][i]))

print(ans)