#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
#define NMAX 5005
int n,g,w[NMAX],p[NMAX],dp[NMAX*2],i, j;

int main(){

    cin>>n>>g;
    for(i=1; i<=n; i++)
        cin>>w[i]>>p[i];

    for(i=1; i<=n; i++)
        for(j=g; j>=w[i]; j--)
            dp[j]=max(dp[j],dp[j-w[i]]+p[i]);

    cout<<dp[g];
    return 0;
}