// Enjoy your stay. #include #define long long long #define LOOPVAR_TYPE long #define all(x) (x).begin(), (x).end() #define max(x, y) ((x) > (y) ? (x) : (y)) #define min(x, y) ((x) < (y) ? (x) : (y)) #define sz(x) ((LOOPVAR_TYPE)(x).size()) #define foreach(it, X) for(__typeof((X).begin()) it = (X).begin(); it != (X).end(); it++) #define GET_MACRO(_1, _2, _3, NAME, ...) NAME #define _rep(i, n) _rep2(i, 0, n) #define _rep2(i, a, b) for(LOOPVAR_TYPE i = (LOOPVAR_TYPE)(a); i < (LOOPVAR_TYPE)(b); i++) #define rep(...) GET_MACRO(__VA_ARGS__, _rep2, _rep)(__VA_ARGS__) #define fir first #define sec second #define mp make_pair #define mt make_tuple #define pb push_back const double EPS = 1e-9; const double PI = acos(-1.0); const long INF = 1070000000LL; const long MOD = 1000000007LL; using namespace std; typedef istringstream iss; typedef stringstream sst; typedef pair pi; typedef vector vi; int main(){ cin.tie(0); ios_base::sync_with_stdio(0); long A,B,T; cin>>A>>B>>T; if(A > T){ cout<= 40000){ rep(b,40001){ long t = b*B; if(t >= T) res = min(res, t); else res = min(res, t + (T-t + A - 1) / A * A); } }else{ rep(b,40001){ long x = T / B*B; long tt = T % B*B; long t = b*B; if(t >= tt) res = min(res, x*B*B + t); else res = min(res, x*B*B + t + (tt-t + A - 1) / A * A); } } cout<