e[]={32,30,32,31,32,31,32,32,31,32,31,32};
*f[]={"%3d","\n%3d","%3d\n\n"};
*a="\n";
*b="";
*c;
m=0,d,w=3,n;
main(){
for(;m<12;m++,(w%7)?puts(a):puts(b)){
for(n=0;n<w%7;n++,printf(" "));
for(d=1;d<e[m];)printf(f[(w++%7==0)],d++);}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).