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

const int N = 5010;
int n, w[N], p[N], dp[N], g;

int main(){
    ifstream cin ("rucsac.in");
    ofstream cout ("rucsac.out");
    cin >> n >> g;
    for (int i=1; i<=n; i++) cin >> w[i] >> p[i];
    for (int i=1; i<=n; i++)
        for (int j=g; j>=w[i]; j--) dp[j] = max(dp[j], dp[j-w[i]] + p[i]);
    cout << dp[g];
    return 0;
}