#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int  n, G, d[10000],g,p;

int main(){

	int i,j;
	freopen("rucsac.in", "r", stdin);
	freopen("rucsac.out", "w", stdout);
	scanf("%d %d", &n, &G);
	for (i = 1; i <= G; i++)
		d[i] = -1;
	for (i = 1; i <= n; i++){

		scanf("%d %d", &g, &p);

		for (j = G - g; j >= 0; j--){
			if (d[j] != -1){
				if (d[j + g] < d[j] + p)
					d[j + g] = d[j] + p;

			}
		}
	}

	int max = 0;
	for (i = 1; i <= G; i++)
		if (max < d[i])
			max = d[i];
	printf("%d", max);
	return 0;
}