View Compilation Error

0_0_25476997_31014.cpp: In function 'void add(int)':
0_0_25476997_31014.cpp:20:14: error: 'n' was not declared in this scope
  while (x <= n) {
              ^
0_0_25476997_31014.cpp: In function 'int main()':
0_0_25476997_31014.cpp:37:26: error: 'n' was not declared in this scope
  while (scanf("%d%d%d", &n, &x, &y) != EOF)
                          ^