=SI(D4=4;CNUM(STXT(A3;CHERCHE("-";SUBSTITUE(A3;",";"-";D4-1);1)+1;NBCAR(A3)));SI(D4=1;CNUM(STXT(A3;1;CHERCHE(",";A3;1)-1));CNUM(STXT((SUBSTITUE(SUBSTITUE(A3;",";"+";D4-1);",";"-";D4-1));(CHERCHE("+";(SUBSTITUE(SUBSTITUE(A3;",";"+";D4-1);",";"-";D4-1));1)+1);(CHERCHE("-";(SUBSTITUE(SUBSTITUE(A3;",";"+";D4-1);",";"-";D4-1));1))-(CHERCHE("+";(SUBSTITUE(SUBSTITUE(A3;",";"+";D4-1);",";"-";D4-1));1)+1)))))