View Compilation Error

0_0_39791750_24499.cpp: In function 'int main()':
0_0_39791750_24499.cpp:23:20: error: unable to find numeric literal operator 'operator""n'
   23 |                 if(56n<=69&&n>=60){
      |                    ^~~
0_0_39791750_24499.cpp:23:20: note: use '-fext-numeric-literals' to enable more built-in suffixes