import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))


n = int(input())
ab = [list(map(int, input().split())) for _ in range(n)]
m = max(sum((ab[i][0] for i in range(n))), sum((ab[i][1] for i in range(n))))
inf = 10**12
dp = [inf]*(m+1)
dp[0] = 0
for a,b in ab:
    ndp = [inf]*(m+1)
    for j in range(m+1)[::-1]:
        if j-a>=0:
            ndp[j] = min(dp[j]+b, dp[j-a])
        else:
            ndp[j] = dp[j] + b
    dp = ndp
ans = float("inf")
for j in range(m+1):
    ans = min(ans ,max(j, dp[j]))
print(ans)