dalao帮忙康一下哪里出问题了；

#include <iostream>
using namespace std;

int main() {
	int s1, s2, s3, a[80], ans, num;
	cin >> s1 >> s2 >> s3;
	for (int i = 1; i < s1; i++) {
		for (int j = 1; j < s2; j++) {
			for (int k = 1; k < s3; k++) {
				a[i + j + k]++;
			}
		}
	}
	ans = 0;
	num = a[0];
	for(int i=1;i<s1+s2+s3;i++){
		if(a[i]>num){
			swap(num,a[i]);
			ans=i;
			if(num==a[i]&&ans<i){
				num==a[i];
			}
		}
	}
	cout<<num;

	return 0;
}

thank you;