#include <stdio.h>

#define K 10000
#define INF 500000001

int profit[K+1];

int max(int x, int y) {
    return (x > y ? x : y);
}

int main(void) {
    FILE *fin = fopen("rucsac.in", "r");
    int n, k;
    fscanf(fin, "%d%d", &n, &k);
    for (int j = 1; j <= k; j++) {
        profit[j] = -INF;
    }
    for (int i = 0; i < n; i++) {
        int g_i, p_i;
        fscanf(fin, "%d%d", &g_i, &p_i);
        for (int j = k; j >= g_i; j--) {
            if (profit[j-g_i] + p_i > profit[j]) {
                profit[j] = profit[j-g_i] + p_i;
            }
        }
    }
    fclose(fin);
    FILE *fout = fopen("rucsac.out", "w");
    int profit_max = -INF;
    for (int j = 1; j <= k; j++) {
        profit_max = max(profit_max, profit[j]);
    }
    fprintf(fout, "%d\n", profit_max);
    fclose(fout);
    return 0;
}