#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[NMAX][GMAX];

int main(){
 
    fin>>n>>gMax;
    for(int i = 1; i <= n; i++){
        fin>>g[i]>>p[i];
    }
    dp[0][0] = 0;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= gMax; j++){
            dp[i][j] = INT_MIN;
        }
    }

    for(int i = 1; i <= n; i++){
        for(int j =1; j <= gMax; j++){
            dp[i][j] = dp[i - 1][j];
            if(j >= g[i]){
                dp[i][j] = max(dp[i][j], dp[i - 1][j - g[i]] + p[i]);
            }
            dp[i][j] = max(dp[i][j], dp[i][j - 1]);
        }
    }
    fout<<dp[n][gMax]<<'\n';
    return 0;
}