import sys
input = sys.stdin.readline

from operator import itemgetter

N,M,Q=map(int,input().split())

AB=[list(map(int,input().split())) for i in range(N)]

DP=[0 for i in range(1<<N)]
DP2=[0 for i in range(1<<N)]

for i in range(1<<N):
    c=0
    v=0
    for j in range(N):
        if i & (1<<j) != 0:
            c+=AB[j][0]
            v+=AB[j][1]

    if c<=M:
        DP[i]=v
    if c<=Q:
        DP2[i]=v

#print(DP)
#print(DP2)

for i in range(N):
    for j in range(1<<N):
        if j & (1<<i) != 0:
            DP[j]=max(DP[j],DP[j^(1<<i)])
            DP2[j]=max(DP2[j],DP2[j^(1<<i)])
                
ANS=0

for i in range(1<<N):
    ANS=max(ANS,DP[i]+DP2[((1<<N)-1)^i])

print(ANS)