比较麻烦

#include <iostream>
#include <cstdio>
using namespace std;
int main(){
    int a;
    int sum=0;
    cin>>a;
    for(int i=1;i<=a;i++){
        int x;
        cin>>x;
        sum+=x;
        if(sum%70==0){
            sum=sum;
        }else{
            sum=sum-sum%70+70;
        }
    }
    double f=sum/70*0.1;
    printf("%.1f",f);
    return 0;
}