View Compilation Error

0_0_15842421_10405.cpp:1:1: error: 'include' does not name a type
 include<cstdio>  
 ^
0_0_15842421_10405.cpp: In function 'int main()':
0_0_15842421_10405.cpp:21:36: error: 'scanf' was not declared in this scope
     while(~scanf("%I64d%I64d",&n,&x))  
                                    ^
0_0_15842421_10405.cpp:23:37: error: 'euler' was not declared in this scope
         printf("%I64d\n",euler(n+x+1));  
                                     ^
0_0_15842421_10405.cpp:23:38: error: 'printf' was not declared in this scope
         printf("%I64d\n",euler(n+x+1));  
                                      ^