n,l=list(map(int,input().split()))
sa=[list(map(int,input().split())) for _ in range (n)]
dp=[[0]*(l+1) for _ in range(n+1)]
for i,(s,a) in enumerate(sa):
    for j in range(l+1):
        if j>=s:
            dp[i+1][j]=max(dp[i][j],dp[i][j-s]+a)
        else:
            dp[i+1][j]=dp[i][j]
print(dp[-1][-1])