foo.cc: In function 'int main()':
foo.cc:19:5: error: expected '}' before 'else'
     else if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
     ^~~~
foo.cc:29:5: error: expected '}' at end of input
     {
     ^
foo.cc:29:5: error: expected '}' at end of input

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