View Compilation Error

0_0_39523203_4919.cpp:15:34: error: stray '\243' in program
   15 | while(scanf("%d%d",&n,&m)!=EOF&&n<a3><a1>=0){
      |                                  ^~~~
0_0_39523203_4919.cpp:15:35: error: stray '\241' in program
   15 | while(scanf("%d%d",&n,&m)!=EOF&&n<a3><a1>=0){
      |                                      ^~~~
0_0_39523203_4919.cpp: In function 'int main()':
0_0_39523203_4919.cpp:15:31: error: lvalue required as left operand of assignment
   15 | while(scanf("%d%d",&n,&m)!=EOF&&n！=0){
      |       ~~~~~~~~~~~~~~~~~~~~~~~~^~~