Given the task definition and input, reply with output. In this task, given a sentence in the English language, your task is to convert it into English Tokens.

about one hundred climbers have perished since June 1 in France, Italy and Switzerland altogether, of whom about twenty have died on Mont Blanc.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
about one hundred climbers have perished since June 1 in France , Italy and Switzerland altogether , of whom about twenty have died on Mont Blanc .