foo.cc: In function 'int main()':
foo.cc:5:14: warning: unused variable 'x' [-Wunused-variable]
    5 |  long long m,x,sum=0,f,a;
      |              ^
foo.cc:5:22: warning: unused variable 'f' [-Wunused-variable]
    5 |  long long m,x,sum=0,f,a;
      |                      ^
foo.cc:5:24: warning: unused variable 'a' [-Wunused-variable]
    5 |  long long m,x,sum=0,f,a;
      |                        ^

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