int add1(int x) {^M     return x + 1;^M}
^Mint subtract1(int x) {^M      return x - 1;^M}
^Mint double_it(int x) {^M      return x * 2;^M}
^Mint halve_it(int x) {^Mreturn x / 2;^M}
^Mint main() {^M        int myint;^M    int result;^M   scanf("%d", &myint);^M  if (myint >= 0) {^M             if (myint <= 10) {^M                    result = halve_it(myint);^M             } else {^M                      result = double_it(myint);^M            }^M     } else {^M              if (myint > -10) {^M                    result = subtract1(myint);^M            } else if (myint > -20) {^M                     result = add1(myint);^M         } else {^M                      result = 3;^M           }
^M      return result;^M}