#include <cstdio>
#include <algorithm>
using namespace std;
#define MAX 10001

int b[MAX],n,g;

int main(){
    int w,p;
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
        scanf("%d %d",&n,&g);
        while(n--)
        {
            scanf("%d %d",&w,&p);
            for(int i=g;i-w>=0;i--) b[i] = max( b[i] , b[i-w] + p );
        }

        printf("%d\n",b[g]);
    return 0;
}