Enter any three coins (denominations). Click "return" on the last entry. The applet shows how many of one type of coins can be replaced with the same number of two other coin types, such that the total sum is the same. "dist" button arranges coins closer or further. In other words, two different collections of coins have the same sum and the same number of coins. (Positives are on the left, negatives are on the right.) ON EITHER SIDE, SAME NUMBER OF COINS ADD UP TO SAME SUM !