/in/foo.c: In function 'main':
/in/foo.c:9:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   else
   ^~~~
/in/foo.c:11:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
    for(i=3;i<=n;i++)
    ^~~