import std;

void main () {
    int N = readln.chomp.to!int;
    int A, B;
    readln.read(A, B);
    auto p = readln.split.to!(int[]);

    int ans = -1;
    foreach (i; 0 .. N) {
        if (p[i] == 1) {
            A--;
        }
        if (p[i] == 2) {
            B--;
        }
        if (p[i] == 3) {
            A--;
            B--;
        }

        if (A < 0 || B < 0) {
            ans = i + 1;
            break;
        }
    }

    writeln(ans);
}

void read (T...) (string S, ref T args) {
    import std.conv : to;
    import std.array : split;
    auto buf = S.split;
    foreach (i, ref arg; args) {
        arg = buf[i].to!(typeof(arg));
    }
}