foo.cc: In function 'int main()':
foo.cc:9:12: warning: iteration 10007 invokes undefined behavior [-Waggressive-loop-optimizations]
    9 |   if(!vis[i])
      |       ~~~~~^
foo.cc:7:15: note: within this loop
    7 |  for(int i=2;i<=10009;i++)
      |              ~^~~~~~~

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Found 10 testcases.
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