#import <Foundation/Foundation.h>
#include <stdio.h>
#include <assert.h>
int remaining(int total, int done) { return done >= total ? 0 : total - done; }
int main(void) {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    printf("%d\n", remaining(4,1));
    [pool drain];
    return 0;
}