#include<iostream>
using namespace std;
int main(){
	int n,m,a[10005],b[10005],dp[10005];
	cin>>n>>m;
	for(int i = 1;i <= n;i++){
		cin>>a[i]>>b[i];
	}
	for(int i = 1;i <= n;i++){
		for(int j = m; j>=1;j--){
			if(j>=b[i]){
				dp[j] = max(dp[j-b[i]]+a[i],dp[j]);
			}
		}
	}
	cout<<dp[m];
	return 0;
}