program exists;
const
        filename='exists';
var
        n,m:longint;
 
procedure init;
var
        x,y,z,i:longint;
begin
        readln(n);
        for i:=1 to n-1 do readln(x,y,z);
        readln(m);
end;
 
begin
        assign(input,filename+'.in'); reset(input);
        assign(output,filename+'.out'); rewrite(output);
 
        init;
        writeln(n+m-1);
 
        close(input); close(output);
end.