How many 3-digit numbers have the property that the units digit is at least twice the tens digit?

a=1;b=0;c=0;p=0; cycle:d=a*100+b*10+c;if(c - b >=2, goto loop, goto next); loop:printd," ",;p=p+1; next:c++;if(c<10, goto cycle, 0);c=0;b++;if(b<10, goto cycle, 0);c=0;b=0;a++;if(a<10, goto cycle,0);print"Total = ",p

OUTPUT = 324 such numbers.

I don't understand your python?

Thanks