Dissolve the yeast in 1 cup of the water. Cook the potatoes, mash very fine and add yeast along with 1 teaspoon salt, 1 teaspoon sugar, and the rest of the water. Put in a jar and leave in a warm place to rise. Sift flour and mix in yeast mixture along with 1 more teaspoon salt and 2 teaspoons sugar. Keep adding flour until it makes a firm dough. Let rise to double, knead and make into loaves. Let rise one hour and then bake at 350~ until it tests done.