#import <Foundation/Foundation.h>

typedef NSInteger (^IntegerBlock)(void);

NSInteger A (NSInteger kParam, IntegerBlock x1, IntegerBlock x2, IntegerBlock x3, IntegerBlock x4, IntegerBlock x5) {
    __block NSInteger k = kParam;
    __block __weak IntegerBlock weak_B;
    IntegerBlock B;
    weak_B = B = ^ {
        return A(--k, weak_B, x1, x2, x3, x4);
    };
    return k <= 0 ? x4() + x5() : B();
}

IntegerBlock K (NSInteger n) {
    return ^{return n;};
}

int main (int argc, const char * argv[]) {
    @autoreleasepool {
        NSInteger result = A(10, K(1), K(-1), K(-1), K(1), K(0));
        NSLog(@"%d\n", result);
    }
    return 0;
}