1048
#include <algorithm>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <list>
 
using namespace std;
 
#define INPUT_FILE "xo.in"
#define OUTPUT_FILE "xo.out"
 
char a[1000010] = {0};
char b[1000010] = {0};
 
int main(void)
{
 
#ifdef ALEX
    freopen("input.in", "r", stdin);
    freopen("output.out", "w", stdout);
#else
//    freopen(INPUT_FILE, "r", stdin);
//    freopen(OUTPUT_FILE, "w", stdout);
#endif
 
    int n;
    int l = 0;
 
    cin >> n;
 
    for(int i = n - 1; i > -1; i--)
        scanf("%d %d", &a[i], &b[i]);
 
    for(int i = 0; i < n; i++)
    {
        b[i+1] += (b[i] + a[i])/10;
        b[i] = (b[i] + a[i])%10;
    }
 
    for(int i = n - 1; i > -1; i--)
        printf("%d", (int)b[i]);
 
    return 0;
}
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