import sys
input = sys.stdin.readline

N, K = map(int, input().split())
piza = [list(map(int, input().split())) for _ in range(N)]
INF = 10**8

piza.sort(key = lambda x:(-x[0]))
dp = [[-INF]*(K+1) for _ in range(2)]
dp[1][0] = 0
for i in range(N):
    P,D = piza[i]
    ndp = [[-INF]*(K+1) for _ in range(2)]
    for k in range(K+1):
        ndp[0][k] = max(ndp[0][k],dp[0][k])
        ndp[1][k] = max(ndp[1][k],dp[1][k])
        ndp[1][k] = max(ndp[1][k],dp[0][k]+D)
        if k+P<=K:
            ndp[0][k+P] = max(ndp[0][k+P],dp[1][k]+D)
    dp = ndp
res = 0
for i in range(2):
    for j in range(K+1):
        res = max(res,dp[i][j])
print(res)