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