#include <fstream>

using namespace std;
int dp[3][10005], c[5005], w[5005];
int main()
{
    ifstream cin("rucsac.in");
    ofstream cout("rucsac.out");
    int n, g;
    cin >> n >> g;
    for(int i = 1; i <= n; i++){
        cin >> w[i] >> c[i];
    }
    for(int i = 1; i <= n; i++){///obiectele
        for(int j = 0; j <= g; j++){///greutatile
            if(w[i] <= j){
                dp[2][j] = max(dp[1][j], (dp[1][j - w[i]] + c[i]));
            }else{
                dp[2][j] = dp[1][j];
            }
        }
        for(int j = 0; j <= g; j++){
            dp[1][j] = dp[2][j];
        }
    }
    cout << dp[2][g];
    return 0;
}