如何添加两个NSNumber对象？

#import<Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSNumber *number1 = @(5);
        NSNumber *number2 = @(7);

        int intValue1 = [number1 intValue];
        int intValue2 = [number2 intValue];

        int sum = intValue1 + intValue2;

        NSNumber *result = @(sum);

        NSLog(@"Sum of %@ and %@ is %@", number1, number2, result);
    }
    return 0;
}