#include<stdio.h>
#include <algorithm>
#define dim 10010
using namespace std;
int d[2][dim];
int i,j,n,m,c,x,y;

int main() {
    freopen("rucsac.in", "r", stdin);
	freopen("rucsac.out", "w", stdout);
    scanf("%d %d", &n, &m);
    for (i=1;i<=n;++i) {
        scanf("%d %d", &x, &y);
        for (j=1;j<=m;++j) {
            d[c][j]=max(d[c][j-1],d[1-c][j]);
            if (j>=x) {
                d[c][j]=max(d[c][j],y+d[1-c][j-x]);
            }
        }
        c=1-c;
    }
    printf("%d", d[1-c][m]);
    return 0;
}