foo.cc: In function 'int main()':
foo.cc:10:21: warning: iteration 100000007 invokes undefined behavior [-Waggressive-loop-optimizations]
   10 |                 f[i]=(f[i-1]+f[i-2])%1000007;
      |                 ~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:9:22: note: within this loop
    9 |         for(int i=3;i<=N;i++){
      |                     ~^~~

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