//注意将价格转化为整数就可以
# include <stdio.h>
# include <algorithm>
# include <string.h>
using namespace std;
int max(int a,int b)
{
return a>b?a:b;
}
int dp[3000050];
int main()
{
int n,i,j,flag,l,m;
int suma,sumb,sumc,sum;
double q,p;
int cot[35];
char c;
while(~scanf("%lf%d",&q,&n),n)
{
l=0;
sum=int(q*100);
memset(cot,0,sizeof(cot));
for(i=0;i<n;i++)
{
scanf("%d",&m);
suma=0;
sumb=0;
sumc=0;
flag=1;
for(j=0;j<m;j++)
{
scanf(" %c:%lf",&c,&p);
{
int p1=int(p*100);
if(c=='A'&&suma+p1<=60000)
suma+=p1;
else if(c=='B'&&sumb+p1<=60000)
sumb+=p1;
else if(c=='C'&&sumc+p1<=60000)
sumc+=p1;
else
flag=0;
}
}
if(flag&&suma+sumb+sumc<=100000)
cot[l++]=suma+sumb+sumc;
}
memset(dp,0,sizeof(dp));
for(i=0;i<l;i++)
{
for(j=sum;j>=cot[i];j--)
dp[j]=max(dp[j],dp[j-cot[i]]+cot[i]);
}
printf("%.2lf\n",dp[sum]/100.0);
}
return 0;
}