#include<cstdio>
using namespace std;
int n ,G,/*p[10001][10001]*/c[10001], sol = 0;
struct xx { int gr, cost;}v[10001];
void citire(){
    freopen("rucsac.in","rt",stdin);
    scanf("%d%d",&n,&G);
    for(int i=1;i<=n ;++i){
        scanf("%d%d",&v[i].gr,&v[i].cost);
    }
}
void pd(){
  c[0] = 0;
	for( int i = 1; i <= n; ++i)
		for( int j = G - v[i].gr; j >= 0; --j) {
			if( c[j+v[i].gr] < c[j] + v[i].cost )
			{
				c[j+v[i].gr] = c[j] + v[i].cost;
				if( c[j+v[i].gr] > sol)
					sol = c[j+v[i].gr];
			}
		}
}
void afisare(){
    int i=n,j=G,k;
    freopen("rucsac.out","wt",stdout);
    printf("%d\n",sol);
}
int main(){
    citire();
    pd();
    afisare();
    return 0;
}