Thirteen.The three men said they did not mind the figure 13, known as the devil's dozen....
In Russia it is referred to as the devil's dozen (çërtova djúzina).
From this store, I got the usual repository of the devil's dozen; sodium metal, magnesium metal, and the three standard ‘ic’ acids, H2SO4, HNO3, and HCl; sufurIC, nitrIC, hydrochlorIC.