N = int(input())
A_costs, B_costs = zip(*(list(map(int, input().split())) for _ in [0]*N))
dp = [sum(B_costs)] * (sum(A_costs)+1)

a_acc = 0
for a_cost, b_cost in zip(A_costs, B_costs):
    for i in range(a_acc, -1, -1):
        if dp[i+a_cost] > dp[i]-b_cost:
            dp[i+a_cost] = dp[i]-b_cost
    a_acc += a_cost

print(min(i if i > v else v for i, v in enumerate(dp)))