#include<cstdio>
#define MAX_N 5000
#define MAX_WEIGHT 10000
using namespace std;

struct object {
    int val, wt;
};

object v[MAX_N];
int dp[2][MAX_WEIGHT+1], GMax, n;

inline int maxim(int x, int y)
{
    if(x >= y) return x;
    return y;
}

void Read() {
    FILE *fin = fopen("rucsac.in","r");
    fscanf(fin,"%d%d",&n,&GMax);
    for(int i=0; i<n; i++)
        fscanf(fin,"%d%d",&v[i].wt,&v[i].val);
    fclose(fin);
}

void dinamica() {
    FILE *fout = fopen("rucsac.out","w");
    int lc, lp, i, j;
    lc = 1; lp = 0;
    for(i=1; i<=n; i++) {
        for(j=1; j<=GMax; j++)
            if(j < v[i-1].wt)
                dp[lc][j] = dp[lp][j];
            else dp[lc][j] = maxim(dp[lp][j], dp[lp][j-v[i-1].wt] + v[i-1].val);
        lc = 1-lc;
        lp = 1-lp;
    }
    fprintf(fout,"%d\n",dp[lp][GMax]);
    fclose(fout);
}

int main() {
    Read();
    dinamica();
    return 0;
}