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

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