import sys


def input(): return sys.stdin.readline().rstrip()


def main():
    N = int(input())
    VT = [list(map(int, input().split())) for i in range(N)]
    VT.sort(key=sum)

    a = [True] + [False] * 2000
    for v, t in VT:
        for i in range(t-1, -1, -1):
            if a[i]:
                a[i+v] = True

    for i in range(len(a)-1, -1, -1):
        if a[i]:
            print(i)
            return


if __name__ == '__main__':
    main()