How many countries on the European Continent has an infant mortality rate per thousand of over 100?
SELECT COUNT(T1.Name) FROM country AS T1 INNER JOIN encompasses AS T2 ON T1.Code = T2.Country INNER JOIN continent AS T3 ON T3.Name = T2.Continent INNER JOIN population AS T4 ON T4.Country = T1.Code WHERE T3.Name = 'Europe' AND T4.Infant_Mortality < 100