n = int(input())
VT = [list(map(int,input().split())) for i in range(n)]
VT.sort(key=lambda x: x[0]+x[1])

dp = [0]*(2*10**4+5)
dp[0] = 1
for v,t in VT:
    for i in range(t)[::-1]:
        if dp[i]:
            dp[i+v] = 1
            break

ans = 0
for i in range(2*10**4+5):
    if dp[i]:
        ans = i
print(ans)