bignum := (abs(x-y)/2) + (x+y)/2;writeln(bignum);
program gadol;uses wincrt;varnum1,num2:integer;bignum:real;beginreadln(num1);readln(num2);bignum := (abs(num1-num2)/2) + (num1+num2)/2;writeln(bignum:1:0);end.