INF = 20000
N = int(input())
L = []
for _ in range(N):
    V,T = map(int,input().split())
    L.append((V + T, V, T))
L.sort()
S,V,T = [list(i) for i in zip(*L)]
DP = [0] * INF
DP[0] = 1
for i in range(N):
    for k in range(T[i]-1,-1,-1):
        DP[k+V[i]] |= DP[k]
for k in range(INF-1,-1,-1):
    if DP[k]:
        print(k)
        break