#include <stdio.h>

using namespace std;
struct obiect{
    short m, p;
} v[5000];

int d[2][10001];

inline int maxim(int a,int b){
    if(a>b)
        return a;
    return b;
}

int main()
{
    int n, G, i, j, g;
    FILE *fi=fopen("rucsac.in", "r"), *fo=fopen("rucsac.out", "w");
    fscanf(fi, "%d%d", &n, &G);
    for(i=0;i<n;i++)
        fscanf(fi, "%hd%hd", &v[i].m, &v[i].p);
    j=0;
    for(i=0;i<n;i++){
        for(g=1;g<v[i].m;g++)
            d[j][g]=d[1-j][g];
        for(g=v[i].m;g<=G;g++)
            d[j][g]=maxim(d[1-j][g],v[i].p+d[1-j][g-v[i].m]);
        j=1-j;
    }
    j=1-j;
    fprintf(fo, "%d", d[j][G]);
    fclose(fi);
    fclose(fo);
    return 0;
}