use std::fs;

fn main() {
    let input = fs::read_to_string("input.txt").unwrap();
    let input: Vec<_> = input.split('\n') // Separate the Time and Distance lines
        .map(|line| {
            line[line.find(':').unwrap() + 1..] // Drop "Time:" and "Distance:"
                .split_whitespace() // Split the numbers into their own elements
                .flat_map(|s| s.chars()).collect::<String>() // Combine the strings into a single one
                .parse::<i64>().expect("Couldn't parse number") // Parse numbers into i32
        }).collect(); // Collect into Vec

    let time = input[0];
    let dist = input[1];
    let mut valid = 0;

    for remaining_time in 0..time {
        if (time - remaining_time) * remaining_time > dist {
            valid += 1;
        }
    }

    println!("{}", valid);
}



// use std::fs;

// fn main() {
//     let input = fs::read_to_string("input.txt").unwrap();
//     let input: Vec<_> = input.split('\n') // Separate the Time and Distance lines
//         .map(|line| {
//             line[line.find(':').unwrap() + 1..] // Drop "Time:" and "Distance:"
//                 .split_whitespace() // Split the numbers into their own elements.
//                 .map(|num| num.parse::<i32>().expect("Couldn't parse number")) // Parse numbers into i32
//                 .collect::<Vec<_>>()
//         }).collect(); // collect into Vec

//     let mut valid_total = 1;

//     for round in 0..input.first().unwrap().len() {
//         let time = input[0][round];
//         let dist = input[1][round];
//         let mut valid = 0;

//         for remaining_time in 0..time {
//             if (time - remaining_time) * remaining_time > dist {
//                 valid += 1;
//             }
//         }
//         valid_total *= valid;
//     }

//     println!("{}", valid_total);
// }