An offer is a proposal made to one or more specific persons to conclude a contract. If its content is very definite and indicates that the offeror has the intention to be bound by its offer once it is accepted. Typical case: on June 8, 2016, Party A sent a telegram to Party B, we have a batch of canned grapes here, do you need it? and received a reply from Party B the next day: If necessary, please give details of the goods and price. Party A sent a power message on June 13: 1500 cases of canned grapes, 545g tin skin, 20 bottles per case, unit price of each bottle is 2.10 yuan, the quality meets the national standard, and the freight of the whole batch of goods is 1200 yuan After receiving the power, Party B called back and requested to change the 545g tin sheet to 300g tin sheet, and requested delivery in the middle of August, and payment at sight. On June 17, considering that the quantity of 300g tin sheet in its inventory was small, Party A had difficulties in delivery in the middle of August and could not meet the needs of Party B, so Party A sent a power generation to tell Party B: we only have 545g tin sheet, which can be delivered in the middle of August. Party B called back on June 21: You sent us a telegram on June 17. We agree. Please also consider the goods with a scale of 300g tin sheet.
According to the above definition, how many offers are there in the above cases?
5