#include<bits/stdc++.h>
using namespace std;
#define int long long
const int maxn = 1005;
int dp[maxn];
int w[maxn],c[maxn];
signed main(){
    int n,m;
    cin >> n >> m;
    for(int i = 0;i<n;++i){
        cin >> w[i] >> c[i];
    }
    for(int i = 0;i<n;++i){
        for(int j = m;j >= w[i];--j){
            dp[j] = max(dp[j],dp[j-w[i]] + c[i]);
        }
    }
    cout << dp[m];
    return 0;
}