#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001


int main(){
	
	int N,I;
	cin>>N>>I;
	
	vector dp(I+1,-Inf32);
	dp[0] = 0;
	
	rep(i,N){
		int a,b;
		cin>>a>>b;
		vector ndp(I+1,-Inf32);
		rep(j,I+1){
			ndp[j] = max(ndp[j],dp[j]);
			if(j + a <= I)ndp[j+a] = max(ndp[j+a],dp[j] + b);
		}
		swap(dp,ndp);
	}
	
	int ans = 0;
	rep(i,I+1)ans = max(ans,dp[i]);
	cout<<ans<<endl;
	
	return 0;
}