import ballerina/io;

function ackermann(int m, int n) returns int {
    if m == 0 { return n + 1; }
    if n == 0 { return ackermann(m - 1, 1); }
    return ackermann(m - 1, ackermann(m, n - 1));
}

public function main() {
    int[][] pairs = [ [1, 3], [2, 3], [3, 3], [1, 5], [2, 5], [3, 5] ];
    foreach var p in pairs {
        io:println(`A[${p[0]}, ${p[1]}] = ${ackermann(p[0], p[1])}`);
    }
}