import pandas as pd

def count_sum(df: pd.DataFrame) -> pd.DataFrame:
    result = df.groupby("Товар")[["Количество"]].sum()
    return result


data = {
    "Дата": ["07.05.2022", "07.05.2022", "08.05.2022", "08.05.2022"],
    "Товар": ["Банан", "Хлеб", "Банан", "Хлеб"],
    "Количество": [30, 10, 40, 8]
}
input_df = pd.DataFrame(data)

print(input_df)


output_df = count_sum(input_df)

print()
print(output_df)