#include<iostream>#include<iomanip>using namespace std;int main(){ int deck; while(cin>>deck,deck) { double total=52*deck-3,sum; int n0,dl,pl1,pl2,player; char a,b,c; cin>>a>>b>>c; if(a>49&&a<58)dl=a-48; else if(a=='A')dl=11; else dl=10; if(b>49&&b<58)pl1=b-48; else if(b=='A')pl1=11; else pl1=10; if(c>49&&c<58)pl2=c-48; else if(c=='A')pl2=11; else pl2=10; player=pl1+pl2==22?12:pl1+pl2; if(dl!=11)if(dl>=player-2){cout<<"0.000%"<<endl<<endl;continue;} if(player-dl>11){cout<<"100.000%"<<endl<<endl;continue;} n0=player-dl-2,sum=0; if(dl==11) {if(dl>=player-1){cout<<"0.000%"<<endl<<endl;continue;}if(pl1==11)sum+=4*deck-2;else if(pl2==11)sum+=4*deck-2;else sum+=4*deck-1; } for(int i=0,j=2;i<n0;i++,j++) {if(j==dl){ if(j==10) sum+=16*deck-1; else sum+=4*deck-1; if(j==pl1)sum-=1; if(j==pl2)sum-=1; continue;}if(j==pl1){ if(j==10) sum+=16*deck-1; else sum+=4*deck-1; if(j==pl2)sum-=1; continue;}if(j==pl2){ if(j==10) sum+=16*deck-1; else sum+=4*deck-1; continue;}if(j==10) sum+=16*deck;else sum+=4*deck; } cout<<fixed<<setprecision(3)<<sum/total*100<<"%"<<endl<<endl; } return 0;}
