/in/foo.cc: In function 'int foundt(int)':
/in/foo.cc:27:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  while(x=addundis(x)){
                    ^
/in/foo.cc: In function 'int addundis(int)':
/in/foo.cc:42:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

FileNotFoundError('input/input1.txt',)