#include <stdio.h>
int main( int argc , char * argv[] ) {
int t;
scanf("%d" , &t);
while ( t-- ) {
int x,y;
scanf("%d%d" , &x , &y);
if ( y > x ) {
printf("No Number\n");
}
else if ( (x + y) & 1 ) {
printf("No Number\n");
}
else if ( x - y > 2 ) {
printf("No Number\n");
}
else if ( x&1 && y&1 ){
printf("%d\n" , x+y-1);
}
else {
printf("%d\n" , x+y);
}
}
return 0;
}
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