A3 A2 A1 A->Y
0 0 0 0 Y=1 
1 0 0 0 Y=1 
1 1 0 0 Y=1 
0 1 0 0 Y=1 
0 1 1 0 Y=1 
1 1 1 0 Y=1 
1 0 1 0 Y=1 
0 0 1 0 Y=1 
0 0 1 1 Y=1 
1 0 1 1 Y=1 
1 1 1 1 Y=0 
0 1 1 1 Y=1 
0 1 0 1 Y=1 
1 1 0 1 Y=1 
1 0 0 1 Y=1 
0 0 0 1 Y=1 
function: Y = !(A3 && A2 && A1 && A)