#include<stdio.h>
#include<string.h>
#define MAX(a,b) (a > b ? a : b)
int main()
{
    int n, v;
    while (~scanf("%d%d",&n, &v) && n + v != 0)
    {
        int i, j, volume, value, dp[v+1];
        memset(dp, 0, sizeof(dp));
        for (i = 1; i <= n; i++)
        {
            scanf("%d%d",&volume, &value);
            for (j = v; j >= volume; j--)
                dp[j] = MAX(dp[j], dp[j-volume] + value);
        }
        printf("%d\n",dp[v]);
    }
    return 0;
}




/*
int main()
{
    int n, v;
    while (~scanf("%d%d",&n, &v) && n + v != 0)
    {
        int i, j, volume[n+1], value[n+1];
        memset(volume, 0, sizeof(volume));
        memset(value, 0, sizeof(value));
        for (i = 1; i <= n; i++)
            scanf("%d%d",&volume[i], &value[i]);
        int dp[n+1][v+1];
        memset(dp, 0, sizeof(dp));
        for (i = 1; i <= n; i++)
        {
            for (j = 1; j <= v; j++)
            {
                if (volume[i] > j)
                    dp[i][j] = dp[i-1][j];
                else
                    dp[i][j] = MAX(dp[i-1][j], dp[i-1][j-volume[i]]+value[i]);
            }
        }
        printf("%d\n",dp[n][v]);
    }
    return 0;
}
*/