用 $180$ 减一下即可。

#include<bits/stdc++.h>
#define int long long
#define INF 0x3f3f3f
using namespace std;
int a,b,c,e,d,f;
signed main(){
	cin>>a>>b>>c>>d>>e>>f;
	cout<<180-a-b-c-d-e-f;
	return 0;
}

表演个暴力

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c,d,e,f;
	cin>>a>>b>>c>>d>>e>>f;
	cout<<180-a-b-c-d-e-f;
	return 0;
}

C++ :

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c,d,e,f;
	cin>>a>>b>>c>>d>>e>>f;
	cout<<180-a-b-c-d-e-f;
	return 0;
}

Python :

# coding=utf-8
a=input().split()
b=int(a[0])+int(a[1])+int(a[2])+int(a[3])+int(a[4])+int(a[5])
c=180-b
print(c)

#include<bits/stdc++.h>
using namespace std;
signed main(){
	int a,b,c,d,e,f;
	cin>>a>>b>>c>>d>>e>>f;
	cout<<180-a-b-c-d-e-f;
}