 Complete the following phrase:  In 16541655 tsar Alexis I tried to carry out a monetary reform and ordered to mint silver one ruble coins from imported joachimsthalers and new kopek coins from copper old silver kopeks was left in circulation. Although around 1 million of such rubles was made, its lower weight 2832 grams against the nominal ruble 48 g led to counterfeiting, speculation and inflation, and after the 