0_0_35042343_3102.cpp: In function 'int main()':
0_0_35042343_3102.cpp:9:12: error: 'mod' was not declared in this scope
a%=mod;
^
0_0_35042343_3102.cpp: In function 'int main()':
0_0_35042343_3102.cpp:21:5: error: redefinition of 'int main()'
int main()
^
0_0_35042343_3102.cpp:3:5: note: 'int main()' previously defined here
int main()
^
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