Define thresholds based on different categories with RowSum

I have this code to categorize people with 3 or more columns out of range, the threshold would be 1015:

cols <- 2:17
df$Myo <- ifelse(rowSums(df[cols] > 1015, na.rm = TRUE) >= 3, 'Yes', 'No')

I would need to trick this code into 2 other codes:

• one code that has a different threshold for by sex (theshold of 1004 for female (df$sex==F) and 986 by male (df$sex==M).

• Other code that selects based on 4 thresholds:

a) first threshold would be males (df$sex==M) living in sweden (df$country==S), this theshold would be 900

b) second threshold would be females (df$sex==F) living in sweden (df$country==S), this theshold would be 1016

c) first threshold would be males (df$sex==M) living in iceland (df$country==I), this theshold would be 800

d) second threshold would be females (df$sex==F) living in iceland (df$country==I), this theshold would be 1000.

Thanks!!