N,A,B = list(map(int,input().split()))

INF = 10**18
now = [[INF for _ in range(A+1)] for _ in range(N+1)]
now[0][0] = 0
for _ in range(N):
    x,y = list(map(int,input().split()))
    next = [[INF for _ in range(A+1)] for _ in range(N+1)]
    for i in range(N+1):
        for j in range(A+1):
            next[i][j] = min(next[i][j], now[i][j])
            if(j+x <= A and i+1 <= N):next[i+1][j+x] = min(next[i+1][j+x], now[i][j] + y)
    now,next = next,now

for i in range(N,-1,-1):
    if(min(now[i]) <= B):
        print(i)
        exit()