#include<cstdio>
using namespace std;
const int NMAX=5005;
int greutate[NMAX],profit[NMAX],castig[5][NMAX*2];
int main(){
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    int n,g,i,j,lin=2;
    scanf("%d%d", &n, &g);
    for(i=1;i<=n;i++)
        scanf("%d%d", &greutate[i], &profit[i]);
    for(i=1;i<=n;i++){
        for(j=0;j<=g;j++){
            castig[3-lin][j]=castig[lin][j];
            if(greutate[i]<=j)
                if(castig[3-lin][j]<castig[lin][j-greutate[i]]+profit[i])
                    castig[3-lin][j]=castig[lin][j-greutate[i]]+profit[i];
        }
        lin=3-lin;
    }
    printf("%d", castig[lin][g]);
    return 0;
}