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    include

    int main() { int n, k; scanf("%d %d", &n, &k);

    int bill[n];
    int total = 0;
    
    // Input bill item
    for(int i = 0; i < n; i++) {
        scanf("%d", &bill[i]);
        total += bill[i];
    }
    
    int b;
    scanf("%d", &b);
    
    // Calculate Anna's actual share
    int anna_share = (total - bill[k]) / 2;
    
    if(anna_share == b) {
        printf("Bon Appetit");
    } else {
        printf("%d", b - anna_share);
    }
    
    return 0;
    

    }