import sys
input = sys.stdin.readline

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

DP=[[1<<63]*(A+1) for i in range(N+1)]
DP[0][0]=0

for tests in range(N):
    x,y=list(map(int,input().split()))

    for i in range(N,-1,-1):
        for j in range(A,-1,-1):
            if i+1<=N and j+x<=A:
                DP[i+1][j+x]=min(DP[i+1][j+x],DP[i][j]+y)

ANS=0
for i in range(N+1):
    for j in range(A+1):
        if DP[i][j]<=B:
            ANS=max(ANS,i)

print(ANS)