=ARRAYFORMULA(IF(LEN(A3:A),
MMULT(IFERROR(LEN(B3:D)/LEN(B3:D), 0), TRANSPOSE(COLUMN(B3:D3)^0)), ))
=ARRAYFORMULA(IF(LEN(A3:A),
MMULT(IFERROR(LEN(REGEXEXTRACT(REGEXREPLACE(B3:D, "OUI", "♦"), "♦"))/
LEN(REGEXEXTRACT(REGEXREPLACE(B3:D, "OUI", "♦"), "♦")), 0),
TRANSPOSE(COLUMN(B3:D3)^0)), ))