codeforces - required reminder

#include<bits/stdc++.h>
using namespace std;

#define ll long long
#define fast()(ios_base::sync_with_stdio(0),cin.tie(NULL));
#define pi pair<int , int>
#define mp make_pair
#define f first
#define s second

int main()
{
    fast();
    ll t;
    cin>>t;
    while(t--)
    {
        ll x,y,n,z;
        cin>>x>>y>>n;
        z=n/x;
        while(1)
        {
            if(x*z+y<=n)break;
            else
                z--;
        }
        cout<<x*z+y<<endl;
    }
}