"Brother Mechanics" hold

Many a dollar coins, put in the wallet too heavy, piled at home and unfortunately, want to spend, how many bus ride?　　Recently, the network quietly popular a "brother Mechanics," he used to accumulate hundreds of pieces of a coin, posing a variety of dangling shape, so that netizens are amazed, call him "folded coin terminator." The so-called "terraced fields" (Fig. 1), that is, the coins are folded into a right triangle, the specification is probably 30x10x15 (cm), the bad is "terraced" part of the coin unexpectedly stretched out of the table, hanging in the air without support.　　In the shape of the "London Bridge" (Fig. 2), there is no other support for nearly 20 centimeters of space between the two pillars. "How many coins do you need?" "There are also a lot of netizens ask questions. "The left and right flank each 6 coins, the first column is the 16x6, the second column 17x5, below the bottom column each 20, thus altogether is 12+96+85+40=233."　　"A netizen carefully counted the total number of coins in London Bridge, and the number of other models required, the answer from 300 to 700." Source: Free Cattle network to share: