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View Compilation Error

0_0_31816838_27369.cpp:1:1: error: 'include' does not name a type
 include <iostream>
 ^
0_0_31816838_27369.cpp: In function 'int f(int)':
0_0_31816838_27369.cpp:7:10: error: 'A' was not declared in this scope
  return (A*f(n-1)+B*f(n-2))%7;
          ^
0_0_31816838_27369.cpp:7:19: error: 'B' was not declared in this scope
  return (A*f(n-1)+B*f(n-2))%7;
                   ^
0_0_31816838_27369.cpp: In function 'int main()':
0_0_31816838_27369.cpp:12:24: error: 'A' was not declared in this scope
  while(scanf("%d%d%d",&A,&B,&n)!=EOF,A||B||n){
                        ^
0_0_31816838_27369.cpp:12:27: error: 'B' was not declared in this scope
  while(scanf("%d%d%d",&A,&B,&n)!=EOF,A||B||n){
                           ^
0_0_31816838_27369.cpp:12:31: error: 'scanf' was not declared in this scope
  while(scanf("%d%d%d",&A,&B,&n)!=EOF,A||B||n){
                               ^
0_0_31816838_27369.cpp:12:34: error: 'EOF' was not declared in this scope
  while(scanf("%d%d%d",&A,&B,&n)!=EOF,A||B||n){
                                  ^
0_0_31816838_27369.cpp:14:18: error: 'printf' was not declared in this scope
   printf("%d\n",a);
                  ^


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