#include <fstream>
#include <set>
using namespace std;

ifstream cin("rucsac.in");
ofstream cout("rucsac.out");

const int MAX = 1e4 + 1;

int dp[MAX] , n , g , w , p;

int main(){

    cin >> n >> g;

    for(int i = 1 ; i <= g ; i++){

        dp[i] = -1;
    }

    for(int i = 1 ; i <= n ; i++){

        cin >> w >> p;

        for(int j = g ; j ; j--){

            if(j-w >= 0 && dp[j-w]!=(-1)){

                dp[j] = max(dp[j],dp[j-w]+p);
            }
        }
    }

    cout << dp[g];

    return 0;
}