Detailed Instructions: This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning).
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.
Q: Passage: The Russo-Swedish War of 1495-1497 was a result of an alliance between Grande Prince Ivan III of Moscow and Hans of Denmark, who was waging war against the Sture family of Sweden in the hope of regaining the Swedish throne. It is believed that Hans promised to concede some stretches of Finnish lands to the Muscovite prince, although he did not bother to honour the agreement after he had been crowned King of Sweden at the close of the war. Pursuant to the agreement, Ivan III sent Princes Daniil Shchenya and Vasily Shuisky to lay siege to the Swedish castle of Viborg. The siege lasted for three months and ended when a castellan set his supply of powder on fire, thus "scaring the Muscovites out of their wits", as the Swedish records say . The following year Russian generals Vasily Kosoy and Andrey Chelyadnin severely devastated Swedish Finland as far as Hameenlinna . Sten Sture the Elder, who was then at Turku , was enraged at the news of the Muscovite expedition and sent Svante Nilsson with 2,000 men to take Ivangorod, a new fortress which Ivan III had built to protect Russian Ingria against Livonian Knights. The fortress was taken without difficulty, but as it was obviously impossible to defend it for a considerable period of time Svante Nilsson proposed to hand it over to the Knights, an offer which they declined. Thereupon the Swedes set the fortress ablaze and sailed home. After the Swedish throne fell to Hans of Denmark, hostilities were suspended until 1508, when Sweden and Moscow ratified a peace treaty for 60 years. Although the war yielded no tangible results to any of the belligerents, both countries corroborated the peace settlement in 1513 and 1524.
A:
How many times did Sweden and Moscow corroborate the peace settlement?