100 CLS
110 INPUT "Y,M ";Y,M:MM=M:D=1:U=Y MOD 4
120 IF U=0 THEN UU=1
130 IF U=0 AND (Y MOD 100)=0 AND (Y MOD 400)>0 THEN UU=0
140 IF M=1 OR M=2 THEN M=M+12:Y=Y-1
150 IF Y<0 OR Y>9999 OR MM<1 OR MM>12 THEN RUN
160 H1=(365*Y+INT(Y/4)-INT(Y/100)+INT(Y/400)+INT((306*(M+1))/10)+D-428)
170 HH=INT(H1/32767):H=(H1-32767*HH) MOD 7
180 FOR I=1 TO 12
190 READ X
200 IF MM=I THEN D=X+28
210 IF MM=2 AND UU=1 THEN D=29
220 NEXT
230 PRINT:PRINT
240 FOR I=1 TO 7
250 READ A$:PRINT A$;" ";
260 NEXT
270 PRINT:PRINT:PRINT SPACE$(H*4);
280 FOR I=1 TO D
290 PRINT USING " ## ";I;:H=H+1
300 IF H=7 THEN H=0:PRINT:PRINT
310 NEXT
320 PRINT
330 IF H>0 THEN PRINT:PRINT
340 END
350 DATA 3,0,3,2,3,2,3,3,2,3,2,3
360 DATA "SUN","MON","TUE","WED","THU","FRI","SAT"