10  DEF  FN MOD(X) = X - INT (X / A) * A
 20  LM = 0: INPUT "GIVE N AND K (N,K): ";N,K
 30  IF N < 1 or K < 1 THEN GOTO 20
 40  FOR A = 1 TO N: LM =  FN MOD(LM + K): NEXT A
 50  PRINT "N = ";N;", K = ";K;", SURVIVOR: ";LM