Buggy python submission (verdict: Runtime Error):
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        let mut next = || { iter.next().unwrap() };
        input_inner!{next, $($r)*}
    };
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}
macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};
    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}
macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };
    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };
    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };
    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
     };
     ($next:expr, $t:ty) => {
         $next().parse::<$t>().expect("Parse error")
    };
}
fn main() {
    input! {
        A: usize,
        B: usize,
        C: usize,
        X: usize
    }

    let mut ans = 0;

    for a in 0..A+1 {
        for b in 0..B+1 {
            let cnt = (0..C+1).filter(|&c| 500*a + 100*b + 50*c == X).count();
            ans += cnt;
        }
    }

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

Fixed submission:
coinA = int(input())
coinB = int(input())
coinC = int(input())
want = int(input())
ways = 0
i = 0
while i <= coinA:
    j = 0
    while j <= coinB:
        k = 0
        while k <= coinC:
            if i*500 + j*100 + k*50 == want:
                ways = ways + 1
            k = k + 1
        j = j + 1
    i = i + 1
print(ways)

Buggy python submission (verdict: Runtime Error):
a = int(input())
b = int(input())
c = int(input())
x = int(input())
 
result = 0             //initialized to zero
 
for ai in range(a+1):
    for bi in range(b+1):
        for ci in range(c+1):
            amount = 500 * ai + 100 * bi + 50 * ci        //formula
            if amount == x:
                result += 1
 
print(result)        //output

Fixed submission:
coinA = int(input())
coinB = int(input())
coinC = int(input())
want = int(input())
ways = 0
i = 0
while i <= coinA:
    j = 0
    while j <= coinB:
        k = 0
        while k <= coinC:
            if i*500 + j*100 + k*50 == want:
                ways = ways + 1
            k = k + 1
        j = j + 1
    i = i + 1
print(ways)

Buggy python submission (verdict: Runtime Error):
a = int(input())
b = int(input())
c = int(input())
x = int(input())
 
ans = 00
 for xx in range(a+1):
    A = 500*xx
    for y in range(b+1):
        B = 100*y
        for z in range(c+1):
            C = 50*z
            if x == A+B+C:
                ans += 1
            else:
                continue
 
print(ans)


Fixed submission:
coinA = int(input())
coinB = int(input())
coinC = int(input())
want = int(input())
ways = 0
i = 0
while i <= coinA:
    j = 0
    while j <= coinB:
        k = 0
        while k <= coinC:
            if i*500 + j*100 + k*50 == want:
                ways = ways + 1
            k = k + 1
        j = j + 1
    i = i + 1
print(ways)