#include<stdio.h>
#define max(a,b) ((a)>(b)?(a):(b))
#define dim 10010
int v[dim],n,g;

int main(){
    int i,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(i=g-w;i>=0;i--)
            v[i+w]=max(v[i+w],v[i]+p);
    }printf("%d\n",v[g]);
}