모든과목이A,B,C,D,F로나눠지잔아요.A+=4.0A=4.0A-=3.67B+=3.33B=3.0B-=2.67C+=2.33C=2.0C-=1.67D+=1.33D=1.0D-=0.67D=0.33D-=0F=0
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