/SNAIL - Con ốc sên

              Uses Crt;
        Var	a,b,v,kq:longint;
        Begin
          readln(a,b,v);
                if a>=v then write(1) else begin
          if (((v-a) mod (a-b))=0) then kq:=(v-a) div (a-b)+1 else
                  kq:=(v-a) div (a-b)+2;
          writeln(kq); end;
          readln;
        End.