View Compilation Error

0_0_39015708_25302.cpp:5:14: error: expected ',' or ';' before '{' token
    5 | int euler(n) {
      |              ^
0_0_39015708_25302.cpp: In function 'long long int dfs(long long int, long long int)':
0_0_39015708_25302.cpp:33:20: error: 'euler' cannot be used as a function
   33 |     int phi = euler(m);
      |               ~~~~~^~~