import sys
input = sys.stdin.readline

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

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

LIST1=[]
LIST2=[]

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:
        LIST1.append(i)
    if c<=Q:
        LIST2.append(i)

LIST=[]
for x in LIST1[::-1]:
    flag=1
    for y in LIST:
        if x|y==y:
            flag=0
            break
    if flag==1:
        LIST.append(x)

LIST1=LIST

LIST=[]
for x in LIST2[::-1]:
    flag=1
    for y in LIST:
        if x|y==y:
            flag=0
            break
    if flag==1:
        LIST.append(x)

LIST2=LIST

ANS=0
for x in LIST1:
    for y in LIST2:
        z=x|y
        score=0

        for i in range(N):
            if z & (1<<i) !=0:
                score+=AB[i][1]
        ANS=max(ANS,score)

print(ANS)