Ans will be 11111. If you understand how static variable works then you will get the idea.
Static Variables in C - GeeksforGeeks
Note: Because of static keyword, whenever you will call a new function(main in this case) the variable i will get updated(--i) but the variable is not local to the function call , due to static key word memory will be created at compile time in stack area.You are calling functions at run time , and every function call will use the same address which is being created at compile time for i. When i will become 0 if condition will be false function we will go back to the caller function and will print (i+1) and value of i is 0. We have called main five times(if(5) to if(1)) so 5 times 1 will be printed.