#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int dp[3001];
int main(){
    int n, g; fin >> n >> g;
    for(int i = 1; i <= n; ++i){
        int w, pr; fin >> w >> pr;
        for(int j = g - w; j >= 0; --j)
            dp[j + w] = max(dp[j + w], dp[j] + pr);
    }
    fout << dp[g];
    return 0;
}