C :

#include<stdio.h>
#define Max(a,b)	(a>b?a:b)
int n,x,max;
long long s;
int main()
{
	scanf("%d %d",&n,&x);
	max=x;s=x;
	for(int i=2;i<=n;i++)
	{
		x=(379*x+131)%997;
		max=Max(max,x);
		s+=max;
	}
	printf("%lld",s);
	return 0;
} 

C++ :

#include<bits/stdc++.h>
using namespace std;
int n,x,a[100001],k,sum;
int main(){
	cin>>n>>x;
	sum = k = a[1] = x;
	for(int i=2;i<=n;i++) {
		a[i]=(379*a[i-1]+131)%997;
	}
	for(int i=2;i<=n;i++){
		if(k > a[i]) {
			a[i] = k;
		}else{
			k = a[i];
		}
		sum += a[i];
	}
	cout<<sum;
	return 0;
}