#include <cstdio>
using namespace std;
int main() {
int a;
int& b = a;
int* c = &b;
scanf("%d", c);
b *= 2;
a += 1;
printf("%d\n", *c);
return 0;
}
I2luY2x1ZGUgPGNzdGRpbz4KdXNpbmcgbmFtZXNwYWNlIHN0ZDsKCmludCBtYWluKCkgewoJaW50IGE7CglpbnQmIGIgPSBhOwoJaW50KiBjID0gJmI7CglzY2FuZigiJWQiLCBjKTsKCWIgKj0gMjsKCWEgKz0gMTsKCXByaW50ZigiJWRcbiIsICpjKTsKCXJldHVybiAwOwp9