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#include <cstdio>

int main()
{
    int h, m, t, mo=0, ms=0;
    scanf("%d%d%d", &h, &m, &t);
    char d[h+2];
    for (int i=0;i<h;i++) {
        scanf(" %c", d+i);
        if (d[i] == '1') ms++;
        else if (d[i] == '2') mo++;
    }
    if (m > mo+ms) {
        m = mo+ms;
    }
    if (ms <= m) {
        printf("%d", h-mo-ms+m);
        return 0;
    }
    int maxx = -1;
    for (int b=0; b<h-2*t; b++) {
        int hmo = mo;
        int hms = ms;
        int bmo = 0;
        int bms = 0;
        for (int i=b;i<b+2*t;i++) {
            if (d[i] == '1') hms--;
            if (d[i] == '2') hmo--;
        }
        for (int e = b+2*t; e < h; e++) {
            if (d[e-t] == '1') bms++;
            if (d[e-t] == '2') bmo++;
            if (d[e] == '1') hms--;
            if (d[e] == '2') hmo--;
            
            if (ms+mo-hmo-bmo-bms > m) continue;
            
            int matt = hmo + bmo + bms;
            int tmo = mo - hmo - bmo;
            int tms = ms - hms - bms;
            int missed = tmo + tms + hms;
            int missable = m - missed;
            if (missable > hmo) missable = hmo;
            int eval = h - (e - b + 1) - (hmo - missable);
            
            if (eval > maxx) {
                maxx = eval;
            }
        }
    }
    printf("%d", maxx);

    return 0;
}