#include <cstdio>
#include <algorithm>
using namespace std;

int n, g;
int dp[10005];
int w, p;

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