#include<stdio.h>

int x = 1;
int f(int y) { return x+y; } // static scoping

// simulated dynamic scoping with mutation
void g() { 
  int savedx = x;  // save previous value of x on stack
  x = 2;           // temporary new value of x
  printf("%d\n", f(0));
  x = savedx;      // restore saved value.
}


int main() {
  int x = 2;
  g();
  printf("%d\n", f(0));
  return 0;
}