import sys
readline=sys.stdin.readline

N=int(readline())
V,T=[],[]
for i in range(N):
    v,t=map(int,readline().split())
    V.append(v)
    T.append(t)
M=max(T)+max(V)
dp=[False]*(M+1)
dp[0]=True
for i in sorted([i for i in range(N)],key=lambda i:V[i]+T[i]):
    for j in range(min(M,T[i]+V[i]-1),V[i]-1,-1):
        dp[j]|=dp[j-V[i]]
ans=0
for i in range(M+1):
    if dp[i]:
        ans=max(ans,i)
print(ans)