#include <stdio.h>

 #include <string.h>

 #define mymax(a, b) (a>b) ? a:b

 float dp[];

 int mon[];

 float fs[];

 int main() {

     int case_n;

     float ff, f;

     int m, v;

     int i, j;

     scanf("%d", &case_n);

     while (case_n--) {

         scanf("%f %d", &ff, &m);

         v = ;

         for (i=; i<=m; ++i) {

             scanf("%d %f", &mon[i], &fs[i]);

             fs[i] =  - fs[i];

             v += mon[i];

         }

         ff =  - ff;

         memset(dp, , sizeof(dp));

         dp[] = ;

         for (i=; i<=m; ++i) {

             for (j=v; j>=mon[i]; --j) {

                 dp[j] = mymax(dp[j], dp[j-mon[i]]*fs[i]);

             }

             /*

             for (j=0; j<=v; ++j) {

                 printf("%f ", dp[j]);

             }

             printf("\n");

             */

         }

         for (i=v; i>; --i)

             if (dp[i] >= ff)

                 break;

         printf("%d\n", i);

     }

     return ;

 }