#int(input())
#map(int, input().split())
#list(map(int, input().split()))

N, I = map(int, input().split())

S = [0] * N
for i in range(N):
    S[i] = list(map(int, input().split()))

dp = [0] * (I+1)

for i in range(N):
    ndp = [0] * (I+1)
    s, a = S[i]
    for j in range(I+1):
        ndp[j] = max(dp[j], ndp[j])
        if j + s <= I:
            ndp[j+s] = max(dp[j] + a, ndp[j+s])
    dp = list(ndp)

# print(dp)
ans = max(dp)
print(dp[I])