#include <bits/stdc++.h>

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

#define NMAX 5005
#define GMAX 10005

int n, p[NMAX], g[NMAX], gMax, dp[GMAX] ,ans;

int main(){
 
    fin>>n>>gMax;
    for(int i = 1; i <= n; i++){
        fin>>g[i]>>p[i];
    }
    for(int i = 1; i <= n ;i++){
        for(int j = gMax; j >= g[i]; j--){
            dp[j] = max(dp[j], dp[j - g[i]] + p[i]);
        }
    }

    for(int i = 0; i <= gMax ; i++){
        ans = max(ans, dp[i]);
    }
    fout<<ans<<'\n';
    return 0;
}