main.py

import sys


def round_half_up(total: int, count: int) -> int:
    return (2 * total + count) // (2 * count)


def solve(data: str) -> str:
    tokens = list(map(int, data.split()))
    if not tokens:
        return ""
    it = iter(tokens)
    n = next(it)
    visits = []
    total_visits = 0
    total_orders = 0
    best_day = 1
    best_orders = -1
    for day in range(1, n + 1):
        v = next(it)
        o = next(it)
        visits.append(v)
        total_visits += v
        total_orders += o
        if o > best_orders:
            best_orders = o
            best_day = day
    recent = visits[-min(3, n):]
    forecast_visits = round_half_up(sum(recent), len(recent))
    forecast_orders = round_half_up(forecast_visits * total_orders, total_visits)
    conversion = total_orders * 100.0 / total_visits
    return "\n".join(
        [
            f"conversion={conversion:.2f}",
            f"forecast={forecast_visits} {forecast_orders}",
            f"best_day={best_day}",
        ]
    )


if __name__ == "__main__":
    sys.stdout.write(solve(sys.stdin.read()).strip())
    sys.stdout.write("\n")