#include<bits/stdc++.h>
using namespace std;

const int N = 1e3 + 5;
const int M = 1e4 + 5;

int n,m;

int f[M];
int v[N],mm[N];

signed main()
{
    freopen("Mining.in","r",stdin);
    freopen("Mining.out","w",stdout);
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin>>n>>m;
    for(int i = 1;i <= n;i++) cin>>v[i]>>mm[i];
    for(int i = 1;i <= n;i++){
        for(int j = m;j >= 0;j--){
            if(j >= mm[i]) f[j] = max(f[j],f[j - mm[i]] + v[i]);
        }
    }
    
    cout<<f[m]<<'\n';
    
    return 0;
}