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use std::io;
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fn main() {
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let mut line = String::new();
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io::stdin().read_line(&mut line).expect("reading stdin");
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let mut i: i64 = 0;
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for word in line.split_whitespace() {
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i += word.parse::<i64>().expect("trying to interpret your input as numbers");
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}
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println!("{}", i);
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}
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