0_0_35909562_23904.cpp: In function 'int main()':
0_0_35909562_23904.cpp:4:27: error: 'scanf' was not declared in this scope
while(scanf("%d %d",&M,&N),M!=-1||N!=-1){
^
0_0_35909562_23904.cpp:23:8: error: expected '}' at end of input
sum=0;
^
0_0_35909562_23904.cpp:23:8: error: expected '}' at end of input
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