#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
    int n, k, w,T;
    int value[25], weight[25], num[1005][25];
    scanf("%d", &T);
    while(T--)
    {
        scanf("%d%d", &n, &k);
        memset(num, 0, sizeof(num));
        for(int i = 0; i<n; i++)
        {
            scanf("%d%d", &value[i], &weight[i]);
        }
        scanf("%d", &w);

        for(int i = 0; i<n; i++)
        {
            for(int j = k; j>0; j--)
            {
                for(int x = w; x>=weight[i]; x--)
                {
                    if(num[x][j] < num[x-weight[i]][j-1]+value[i])
                        num[x][j] = num[x-weight[i]][j-1]+value[i];
                }
            }
        }
        printf("%d\n", num[w][k]);
    }
    return 0;
}