Market research of a cereal company interviewing 100 people found that for breakfast on any one day, 72 people ate cereals, 39 people ate eggs, 75 people ate toast. 32 people ate cereal and egg, 53 people ate cereal and toast, 26 people ate toast and egg. Of these, 21 ate cereals, toast and eggs. How many interviewed people ate neither cereal, nor toast nor egg?